Hydrodictyon hi-res stock photography and images

RMHRF60G–Hydrodictyon sp. Algae, LM

Hydrodictyon algae magnification 200x This algae has become pest on some parts planet forming large nets over areas water Stock Photo

RMD76T05–Hydrodictyon algae magnification 200x This algae has become pest on some parts planet forming large nets over areas water

Photomicrograph of living green algae Hydrodictyon reticulatum Stock Photo

RMA4B449–Photomicrograph of living green algae Hydrodictyon reticulatum

Anna Atkins, English, 1797-1871, Hydrodictyon utriculatum, 1843 or 1844, cyanotype, Page: 10 3/8 × 8 1/8 inches (26.4 × 20.6 cm Stock Photo

RM2A2RA01–Anna Atkins, English, 1797-1871, Hydrodictyon utriculatum, 1843 or 1844, cyanotype, Page: 10 3/8 × 8 1/8 inches (26.4 × 20.6 cm

Inspired by Hydrodictyon utriculatum, Anna Atkins, United Kingdom, c. 1843 - c. 1853, cyanotype, height 250 mm × width 200 mm, Reimagined by Artotop. Classic art reinvented with a modern twist. Design of warm cheerful glowing of brightness and light ray radiance. Photography inspired by surrealism and futurism, embracing dynamic energy of modern technology, movement, speed and revolutionize culture Stock Photo

RF2HKDYX0–Inspired by Hydrodictyon utriculatum, Anna Atkins, United Kingdom, c. 1843 - c. 1853, cyanotype, height 250 mm × width 200 mm, Reimagined by Artotop. Classic art reinvented with a modern twist. Design of warm cheerful glowing of brightness and light ray radiance. Photography inspired by surrealism and futurism, embracing dynamic energy of modern technology, movement, speed and revolutionize culture

Hydrodictyon showing its net like mesh of cells. Microscope view at 40x. Stock Photo

RF2JP2T94–Hydrodictyon showing its net like mesh of cells. Microscope view at 40x.

Magnified image of common moss, Phascum cuspidatum 1, and microscopic enlargment of pond algae, Hydrodictyon utriculatum 2. Handcoloured copperplate engraving from Bertuch's 'Bilderbuch fur Kinder' (Picture Book for Children), Weimar, 1798. Friedrich Johann Bertuch (1747-1822) was a German publisher and man of arts most famous for his 12-volume encyclopedia for children illustrated with 1,200 engraved plates on natural history, science, costume, mythology, etc., published from 1790-1830. Stock Photo

RMP6ENPT–Magnified image of common moss, Phascum cuspidatum 1, and microscopic enlargment of pond algae, Hydrodictyon utriculatum 2. Handcoloured copperplate engraving from Bertuch's 'Bilderbuch fur Kinder' (Picture Book for Children), Weimar, 1798. Friedrich Johann Bertuch (1747-1822) was a German publisher and man of arts most famous for his 12-volume encyclopedia for children illustrated with 1,200 engraved plates on natural history, science, costume, mythology, etc., published from 1790-1830.

RM2A7BXCF–Magnified image of common moss, Phascum cuspidatum 1, and microscopic enlargment of pond algae, Hydrodictyon utriculatum 2. Handcoloured copperplate engraving from Bertuch's 'Bilderbuch fur Kinder' (Picture Book for Children), Weimar, 1798. Friedrich Johann Bertuch (1747-1822) was a German publisher and man of arts most famous for his 12-volume encyclopedia for children illustrated with 1,200 engraved plates on natural history, science, costume, mythology, etc., published from 1790-1830.

Hydrodictyon utriculatum (NYPL b11861683-419653) Stock Photo

RMJHJDDG–Hydrodictyon utriculatum (NYPL b11861683-419653)

RMW308GD–PSM V60 D080 Hydrodictyon

RM2EBBGBM–Hydrodictyon utriculatum

Hydrodictyon utriculatum, Anna Atkins, c. 1843 - c. 1853 photograph United Kingdom photographic support cyanotype algae, seaweed Stock Photo

RM2WC081F–Hydrodictyon utriculatum, Anna Atkins, c. 1843 - c. 1853 photograph United Kingdom photographic support cyanotype algae, seaweed

Text-book of botany, morphological and physiological . ow in these caseswithin the mother-cell a creeping motion whichlasts for a considerabletime before they becomeconnected into a surface(Pediastrum), or in the formof a sac-hke hollow net(Hydrodictyon), and formby their growth a tissue.In the same manner thesister-cells (endosperm) which arise in the embryo-sac of Phanerogams by free-cell-formation, unite with one another and with the wall of the embryo-sac itself, con-tinuing then to develop as a continuous tissue and to increase by division. In Fungi and Lichens the formation of tissue ori Stock Photo

RM2AX1YFC–Text-book of botany, morphological and physiological . ow in these caseswithin the mother-cell a creeping motion whichlasts for a considerabletime before they becomeconnected into a surface(Pediastrum), or in the formof a sac-hke hollow net(Hydrodictyon), and formby their growth a tissue.In the same manner thesister-cells (endosperm) which arise in the embryo-sac of Phanerogams by free-cell-formation, unite with one another and with the wall of the embryo-sac itself, con-tinuing then to develop as a continuous tissue and to increase by division. In Fungi and Lichens the formation of tissue ori

Hydrodictyon upticulatum; Seaweed. . Stock Photo

RM2G42HYN–Hydrodictyon upticulatum; Seaweed. .

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 8/ Pediastrum elegans Stock Photo

RMB6RYWK–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 8/ Pediastrum elegans

green algae on a pond, pond life Stock Photo

RMJYWDE9–green algae on a pond, pond life

. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 640 THE SUBDIVISIONS OF THE VEGETABLE KINGDOM. Hydrodictyon, the Water-net (figs. 370 ^ and 370^) is a beautiful organism forming net-like colonies of cylindrical cells, which are joined end to end, formmg the sides of the polygonal meshes. Each cell may be as much as 1 centimetre in length. A thin layer of protoplasm containing numerous small nuclei lines the wall and incloses a large central vacuole. The chromatophore, or chlorophyll-layer of the protoplasm, contains many pyrenoids, each surrounded Stock Photo

RMPG1RGX–. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 640 THE SUBDIVISIONS OF THE VEGETABLE KINGDOM. Hydrodictyon, the Water-net (figs. 370 ^ and 370^) is a beautiful organism forming net-like colonies of cylindrical cells, which are joined end to end, formmg the sides of the polygonal meshes. Each cell may be as much as 1 centimetre in length. A thin layer of protoplasm containing numerous small nuclei lines the wall and incloses a large central vacuole. The chromatophore, or chlorophyll-layer of the protoplasm, contains many pyrenoids, each surrounded

. Fig. 68. Hydrodictyon utriculatum: a Teil eines ausgewachsenen Netzes, h junges Netz noch in der Matterzelle eingeschlossen, c Stück desselben, d optischer Durchschnitt durch eine Zelle, e Schwärmer aus der Zygote, / Geißelinsertion, g Dauerzelle, sog. Polyeder, // Gruppe von Zoosporen, / Netzbildung in der Dauerspore (68a nach Chodat, b, c und h nach Klebs, d und y nach Timberlake , e, g und /' nach Frings he im). Stock Photo

RMMCPA36–. Fig. 68. Hydrodictyon utriculatum: a Teil eines ausgewachsenen Netzes, h junges Netz noch in der Matterzelle eingeschlossen, c Stück desselben, d optischer Durchschnitt durch eine Zelle, e Schwärmer aus der Zygote, / Geißelinsertion, g Dauerzelle, sog. Polyeder, // Gruppe von Zoosporen, / Netzbildung in der Dauerspore (68a nach Chodat, b, c und h nach Klebs, d und y nach Timberlake , e, g und /' nach Frings he im).

RMHRJ3GA–Hydrodictyon sp. Algae, LM

RMD76T00–Hydrodictyon algae magnification 200x This algae has become pest on some parts planet forming large nets over areas water

Hydrodictyon utriculatum, Anna Atkins, United Kingdom, c. 1843 - c. 1853, photographic support, cyanotype, height 250 mm × width 200 mm Stock Photo

RM2HB7G31–Hydrodictyon utriculatum, Anna Atkins, United Kingdom, c. 1843 - c. 1853, photographic support, cyanotype, height 250 mm × width 200 mm

Art inspired by Hydrodictyon utriculatum, Anna Atkins, United Kingdom, c. 1843 - c. 1853, photographic support, cyanotype, height 250 mm × width 200 mm, Classic works modernized by Artotop with a splash of modernity. Shapes, color and value, eye-catching visual impact on art. Emotions through freedom of artworks in a contemporary way. A timeless message pursuing a wildly creative new direction. Artists turning to the digital medium and creating the Artotop NFT Stock Photo

RF2HKYY95–Art inspired by Hydrodictyon utriculatum, Anna Atkins, United Kingdom, c. 1843 - c. 1853, photographic support, cyanotype, height 250 mm × width 200 mm, Classic works modernized by Artotop with a splash of modernity. Shapes, color and value, eye-catching visual impact on art. Emotions through freedom of artworks in a contemporary way. A timeless message pursuing a wildly creative new direction. Artists turning to the digital medium and creating the Artotop NFT

Hydrodictyon showing its net like mesh of cells. Microscope view at 100x. Stock Photo

RF2JP2TAF–Hydrodictyon showing its net like mesh of cells. Microscope view at 100x.

Hydrodictyon utriculatum Hydrodictyon utriculatum Object Type : photo page Item number: RP-F 2016-133-191 Manufacturer : photographer Anna Atkins Place manufacture: United Kingdom Dating: ca. 1843 - ca. 1853 Material: paper Technique: cyanotypie Dimensions: Pages: 250 h mm × W 200 mm Subject: algae, seaweed Stock Photo

RM2B6W5WK–Hydrodictyon utriculatum Hydrodictyon utriculatum Object Type : photo page Item number: RP-F 2016-133-191 Manufacturer : photographer Anna Atkins Place manufacture: United Kingdom Dating: ca. 1843 - ca. 1853 Material: paper Technique: cyanotypie Dimensions: Pages: 250 h mm × W 200 mm Subject: algae, seaweed

Elementary botany . Fig. 165.Pleurococcus(protococcus)vulgaris.. Fig. 166.Pediastrum boryanum. A, mature colony, most of the young colonies haveescaped from their mother cells; at g, a young colony is escaping; sp, emptymother cells; B, young colony, C, same colony with spares arranged in order.(After Braun.) plants are rather common in fresh-water pools, the latter one intermingledwith filamentous algae, while the former forms large sheets or nets. Mul-tiplication in Hydrodictyon takes place by the protoplasm in one of the cells 162 MORPHOLOGY. dividing into thousands of minute cells, which g Stock Photo

RM2AJDNK4–Elementary botany . Fig. 165.Pleurococcus(protococcus)vulgaris.. Fig. 166.Pediastrum boryanum. A, mature colony, most of the young colonies haveescaped from their mother cells; at g, a young colony is escaping; sp, emptymother cells; B, young colony, C, same colony with spares arranged in order.(After Braun.) plants are rather common in fresh-water pools, the latter one intermingledwith filamentous algae, while the former forms large sheets or nets. Mul-tiplication in Hydrodictyon takes place by the protoplasm in one of the cells 162 MORPHOLOGY. dividing into thousands of minute cells, which g

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 3/ Pediastrum granulatum Stock Photo

RMB6T6XD–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 3/ Pediastrum granulatum

RMJYWDE8–green algae on a pond, pond life

. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 804 THE DISTRIBUTION OF SPECIES BY OFFSHOOTS. which the offshoot formation occurs is divided into four, more rarely two or eight clumps are formed by the splitting and dividing of the protoplasm, and most rarely of all is the whole undivided protoplasm of a cell transformed into a single offshoot. The small group of water-plants known as the Hydrodictyaceee display a peculiar offshoot-formation. In the elegant Water-net {Hydrodictyon utriculatum, cf. p. 640), whose cylindrical cells form a closed net Stock Photo

RMPG2MC1–. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 804 THE DISTRIBUTION OF SPECIES BY OFFSHOOTS. which the offshoot formation occurs is divided into four, more rarely two or eight clumps are formed by the splitting and dividing of the protoplasm, and most rarely of all is the whole undivided protoplasm of a cell transformed into a single offshoot. The small group of water-plants known as the Hydrodictyaceee display a peculiar offshoot-formation. In the elegant Water-net {Hydrodictyon utriculatum, cf. p. 640), whose cylindrical cells form a closed net

. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 42. Hydrodictyon reticiilattim {Jj.) Lagerh. A ein kleiner Teil eines sehr jungen Netzes, welches aus Schwarm- sporen entstanden ist; 5 Gamet; C Zygospore; D aus der keimenden Zygospore entwickeln sich 4 große Schwärm- sporen ; E zweiwimperige Schwärmspore; Fein aus einer keimenden Schwärmspore entstandenes junges Polyeder; G die kleinen Sehwärmsporen im Innern des Polyeders haben sich zu einem embryonalen Netz Stock Photo

RMME6KDG–. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 42. Hydrodictyon reticiilattim {Jj.) Lagerh. A ein kleiner Teil eines sehr jungen Netzes, welches aus Schwarm- sporen entstanden ist; 5 Gamet; C Zygospore; D aus der keimenden Zygospore entwickeln sich 4 große Schwärm- sporen ; E zweiwimperige Schwärmspore; Fein aus einer keimenden Schwärmspore entstandenes junges Polyeder; G die kleinen Sehwärmsporen im Innern des Polyeders haben sich zu einem embryonalen Netz

RM2YM599D–Water Nets (Hydrodictyon)

. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ranged in the manner of a net in Hydrodictyon. In thedisc-like ccenobium of Pediastrum, in which there may be more than 100ccenocytes, those of the marginal series differ in external characters from thosein the centre; but in the net-like ccenobium of Hydrodictyon they are allof the same cylindrical shape and many hundreds may be united to forma large irregular colony. ffi/di odictyacese 217 The normal method of reproduction is by the formati Stock Photo

RM2CDF9KK–. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . ranged in the manner of a net in Hydrodictyon. In thedisc-like ccenobium of Pediastrum, in which there may be more than 100ccenocytes, those of the marginal series differ in external characters from thosein the centre; but in the net-like ccenobium of Hydrodictyon they are allof the same cylindrical shape and many hundreds may be united to forma large irregular colony. ffi/di odictyacese 217 The normal method of reproduction is by the formati

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 5/ Pediastrum crutiatum Stock Photo

RMB6RY89–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 5/ Pediastrum crutiatum

. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 88 HISTOLOGY AND PHYSIOLOGY. (Fig. 200), Nostoc (Fig. 201). A common example of a cell-colony, or spurious tissue, is furnished by the fresh-water Alga, Water-net (Hydrodictyon). The separate motiie cells (zoospores) into which the protoplasm breaks up arrange themselves and unite so as to form a net while yet in the mother-cell. The term tissue is used to denote a permanent union of cells. They may be united e Stock Photo

RMPG4163–. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 88 HISTOLOGY AND PHYSIOLOGY. (Fig. 200), Nostoc (Fig. 201). A common example of a cell-colony, or spurious tissue, is furnished by the fresh-water Alga, Water-net (Hydrodictyon). The separate motiie cells (zoospores) into which the protoplasm breaks up arrange themselves and unite so as to form a net while yet in the mother-cell. The term tissue is used to denote a permanent union of cells. They may be united e

. Die Bedingungen der Fortpflanzung bei einigen Algen und Pilzen . Fig;. 4. Hydrodictyon utriculatum. Ä ein Stück eines Netzes; B eine Zelle mit einem eben gebildeten Netz innerhalb der stark aufgequollenen Zelhvand; C eine Anzahl Zoosporen mit einander verbunden (in dieser Gruppierung sich auch bewegend), die drei nach der Mitte gerichteten Zoosporen der Deutlichkeit wegen ohne Cilien gezeichnet; D eine einzelne Gamete; E Kopulation zweier Gameten; i^'eine Zygote. Vergr. von A und B 120, C—E 1000. Stock Photo

RMMEJX0F–. Die Bedingungen der Fortpflanzung bei einigen Algen und Pilzen . Fig;. 4. Hydrodictyon utriculatum. Ä ein Stück eines Netzes; B eine Zelle mit einem eben gebildeten Netz innerhalb der stark aufgequollenen Zelhvand; C eine Anzahl Zoosporen mit einander verbunden (in dieser Gruppierung sich auch bewegend), die drei nach der Mitte gerichteten Zoosporen der Deutlichkeit wegen ohne Cilien gezeichnet; D eine einzelne Gamete; E Kopulation zweier Gameten; i^'eine Zygote. Vergr. von A und B 120, C—E 1000.

Hydrodictyon utriculatum Hydrodictyon utriculatumHydrodictyon utriculatum. Stock Photo

RM2AC69P4–Hydrodictyon utriculatum Hydrodictyon utriculatumHydrodictyon utriculatum.

RM2CH2GXD–. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . arranged in the manner of a net in Hydrodictyon. In thedisc-like coenobium of Pediastrum, in which there may be more than 100coenocytes, those of the marginal series differ in external characters from thosein the centre; but in the net-like coenobium of Hydrodictyon they are allof the same cylindrical shape and many hundreds may be united to forma large irregular colony. Hydt odictyacese 217 The normal method of reproduction is by the formati

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 9/ Pediastrum lunatum Stock Photo

RMB6T034–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 9/ Pediastrum lunatum

. Botany for agricultural students . Botany. 312 THALLOPHYTES duce a new plant directly but, as in Hydrodictyon, produces a number of zoospores each of which produces a new plant. Thus, instead of one, a number of new plants arise from the zygospore, a feature of advantage in the multiplication of new plants. Another form, similar in a number of ways to Ulothrix, is Cladophora which has long branched filaments that form long, green, hair-like tufts, which, with one end anchored to a stone or some other object, wave back and forth in moving streams. The cells are multinucleate and contain many Stock Photo

RMPG4BB9–. Botany for agricultural students . Botany. 312 THALLOPHYTES duce a new plant directly but, as in Hydrodictyon, produces a number of zoospores each of which produces a new plant. Thus, instead of one, a number of new plants arise from the zygospore, a feature of advantage in the multiplication of new plants. Another form, similar in a number of ways to Ulothrix, is Cladophora which has long branched filaments that form long, green, hair-like tufts, which, with one end anchored to a stone or some other object, wave back and forth in moving streams. The cells are multinucleate and contain many

. Fig. 45. Protosiphon botryoides, i Zellen bei dichtem Wuchs. 2 Zellen, welche isoliert wachsen, in Verzweigung begriffen. 3—4 Schwärnierbildung in verschiedenen alten Zellen. 5 Cyste, zum Teil entleert. 6 Partheno- spore. 7 Keimung aus derselben. 8—9 Zygoten. 10 Cystenbildung. (Nach Klebs aus Oltmanns, Algen.) Hydrodictyaceae. Zellen von verschiedener Gestalt, lang-zylindrisch bei Hydro- dictyou, mehr weniger eckig, ausgerandet oder mit Fortsätzen ver- sehen bei Enastropsis und Pediastrum, stets unbeweglich, zu bestimmt geformten Kolonien vereinigt. Die Zellen sind bei Hydrodictyon Stock Photo

RMMCPA4J–. Fig. 45. Protosiphon botryoides, i Zellen bei dichtem Wuchs. 2 Zellen, welche isoliert wachsen, in Verzweigung begriffen. 3—4 Schwärnierbildung in verschiedenen alten Zellen. 5 Cyste, zum Teil entleert. 6 Partheno- spore. 7 Keimung aus derselben. 8—9 Zygoten. 10 Cystenbildung. (Nach Klebs aus Oltmanns, Algen.) Hydrodictyaceae. Zellen von verschiedener Gestalt, lang-zylindrisch bei Hydro- dictyou, mehr weniger eckig, ausgerandet oder mit Fortsätzen ver- sehen bei Enastropsis und Pediastrum, stets unbeweglich, zu bestimmt geformten Kolonien vereinigt. Die Zellen sind bei Hydrodictyon

. Album général des diatomées marines, d'eau douce ou fossiles : album représentant tous les genres de diatomées et leurs principales espèces. Diatoms. Hydrodictyon reticulatum VT. CHLOROPHYCE^ 2. Protococcales. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coupin, Henri, b. 1868. Paris : H. Coupin Stock Photo

RMRPWP4W–. Album général des diatomées marines, d'eau douce ou fossiles : album représentant tous les genres de diatomées et leurs principales espèces. Diatoms. Hydrodictyon reticulatum VT. CHLOROPHYCE^ 2. Protococcales. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coupin, Henri, b. 1868. Paris : H. Coupin

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 13/ Pediastrum Darwinii Stock Photo

RMB6RYAB–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 13/ Pediastrum Darwinii

. Botany for agricultural students . Botany. HYDRODICTYON 309 Pediastrum. — A more complicated colony occurs in Pedi- astrum (Fig. 264), another form common in ponds and other quiet waters in warm weather. The cells, which are quite numerous in some species, form plate-like colonies in which marginal cells differ in form from those within. Both zoospores and gametes are produced in this form. Any cell may form zoospores, which escape from the mother cell enclosed in a membrane and then arrange themselves into a new colony. Instead of zoospores the cells may form gametes, which. Fig. 265. — Wat Stock Photo

RMPG4BC0–. Botany for agricultural students . Botany. HYDRODICTYON 309 Pediastrum. — A more complicated colony occurs in Pedi- astrum (Fig. 264), another form common in ponds and other quiet waters in warm weather. The cells, which are quite numerous in some species, form plate-like colonies in which marginal cells differ in form from those within. Both zoospores and gametes are produced in this form. Any cell may form zoospores, which escape from the mother cell enclosed in a membrane and then arrange themselves into a new colony. Instead of zoospores the cells may form gametes, which. Fig. 265. — Wat

. Bulletin Societe D'Histoire Naturelle de Toulouse (et de Midi Pyrenees).. Société d'Histoire naturelle de Toulouse. 1898-1899. J. COMÈRE del. Zagarafe â Se6///e . Hydrodictyon utriculatum de Roth et Hydrodictyon fémorale d'Arrondeau.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Société d'histoire naturelle de Toulouse. Stock Photo

RMRG9J3A–. Bulletin Societe D'Histoire Naturelle de Toulouse (et de Midi Pyrenees).. Société d'Histoire naturelle de Toulouse. 1898-1899. J. COMÈRE del. Zagarafe â Se6///e . Hydrodictyon utriculatum de Roth et Hydrodictyon fémorale d'Arrondeau.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Société d'histoire naturelle de Toulouse.

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 11/ Pediastrum Braunii Stock Photo

RMB7283F–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 11/ Pediastrum Braunii

. Text-book of botany, morphological and physiological. Botany. <z$6 THALLOPHYTES. resemblance in their mode of origin and subsequent development to those of the Pandorinese. When the ccenobia multiply, a large number of zoogonidia are formed in each mother-cell, within which they move about for some time; when they come to rest they congregate in some definite arrangement, and then continue their develop- ment unitedly, eventually again multiplying in the same way, as for instance in Pediastrum (Fig. 169). In Hydrodictyon utriculatum, which occurs occasionally in ditches, the mature. FIG. Stock Photo

RMRPXPA7–. Text-book of botany, morphological and physiological. Botany. <z$6 THALLOPHYTES. resemblance in their mode of origin and subsequent development to those of the Pandorinese. When the ccenobia multiply, a large number of zoogonidia are formed in each mother-cell, within which they move about for some time; when they come to rest they congregate in some definite arrangement, and then continue their develop- ment unitedly, eventually again multiplying in the same way, as for instance in Pediastrum (Fig. 169). In Hydrodictyon utriculatum, which occurs occasionally in ditches, the mature. FIG.

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 4/ Pediastrum octonum Stock Photo

RMB7289N–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 4/ Pediastrum octonum

RMRDG9XY–. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 804 THE DISTRIBUTION OF SPECIES BY OFFSHOOTS. which the offshoot formation occurs is divided into four, more rarely two or eight clumps are formed by the splitting and dividing of the protoplasm, and most rarely of all is the whole undivided protoplasm of a cell transformed into a single offshoot. The small group of water-plants known as the Hydrodictyaceee display a peculiar offshoot-formation. In the elegant Water-net {Hydrodictyon utriculatum, cf. p. 640), whose cylindrical cells form a closed net

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 15/ Pediastrum solare Stock Photo

RMB6T6WE–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 15/ Pediastrum solare

RMRDGAPA–. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. 640 THE SUBDIVISIONS OF THE VEGETABLE KINGDOM. Hydrodictyon, the Water-net (figs. 370 ^ and 370^) is a beautiful organism forming net-like colonies of cylindrical cells, which are joined end to end, formmg the sides of the polygonal meshes. Each cell may be as much as 1 centimetre in length. A thin layer of protoplasm containing numerous small nuclei lines the wall and incloses a large central vacuole. The chromatophore, or chlorophyll-layer of the protoplasm, contains many pyrenoids, each surrounded

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 6/ Pediastrum selenaea Stock Photo

RMB6T01R–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 6/ Pediastrum selenaea

. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. LIMNOLOGY OF BIG BEAR LAKE 103 TABLE 3. Phytoplankton Genera Identified from Big Bear Lake, California, November 1976- November 1978. Chlorophyta (green algae) Ankistrodesmus Chlamydomonas Chlorella Closterium Cosmarlum Eudorina Euglena Gloeocystis Hydrodictyon Pandorina Pediastnim Scenedesmus Sphaerocystis Spirogyra Staurastrum Volvox Zygnema Chrysophyta (diatoms) Amphora Anomoeoneis Asterionella Caloneis Chrysococcus Cocconeis Cyclo Stock Photo

RMRG3NFH–. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. LIMNOLOGY OF BIG BEAR LAKE 103 TABLE 3. Phytoplankton Genera Identified from Big Bear Lake, California, November 1976- November 1978. Chlorophyta (green algae) Ankistrodesmus Chlamydomonas Chlorella Closterium Cosmarlum Eudorina Euglena Gloeocystis Hydrodictyon Pandorina Pediastnim Scenedesmus Sphaerocystis Spirogyra Staurastrum Volvox Zygnema Chrysophyta (diatoms) Amphora Anomoeoneis Asterionella Caloneis Chrysococcus Cocconeis Cyclo

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 1/ Pediastrum tetras Stock Photo

RMB6RY7E–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 1/ Pediastrum tetras

. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. Fig. 4.9—The network of Hydrodictyon becomes distended and unorganized by treat- ment with colchicine. A. Control cells. B. Treated cellular network. (After Gorter) Sugar beets developed alter a treatment showed consistent size increase for roots, but polyploidy was not found with these particular cases. Larger roots are regularly developed in known triploid and tetraploid progenies."-' Barring some error in method, the explanation for larger beets falls outside the scope of polyploidy. Perplexing varia Stock Photo

RMREJC4M–. Colchicine in agriculture, medicine, biology, and chemistry. Colchicine; Colchicine. Fig. 4.9—The network of Hydrodictyon becomes distended and unorganized by treat- ment with colchicine. A. Control cells. B. Treated cellular network. (After Gorter) Sugar beets developed alter a treatment showed consistent size increase for roots, but polyploidy was not found with these particular cases. Larger roots are regularly developed in known triploid and tetraploid progenies."-' Barring some error in method, the explanation for larger beets falls outside the scope of polyploidy. Perplexing varia

Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 14/ Pediastrum trochiscus Stock Photo

RMB6T6WJ–Melethallia / Gesellige Algetten, Fam Hydrodictyea / Hydrodictyaceae, Name Pediastrum, 14/ Pediastrum trochiscus

. Botany of the living plant. Botany; Plants. GREEN ALGAE 365 colonial forms, the remarkable organism, the Water-net, Hydrodictyon reticulatuyn, representing the highest state of organisation in the Order. The very common unicellular green alga, Pleurococcus Naegelii, Chod. (Protococcus viridis), Fig. 269, found as <. green incrustation on the windward side of tree-trunks, walls, etc., was formerly placed in this group. It is now considered to be a very reduced member of a considerably more advanced group, the Chaetophoraceae. Multiplication is by cell-division, Fig. 269, no motile stage an Stock Photo

RMRH8DKY–. Botany of the living plant. Botany; Plants. GREEN ALGAE 365 colonial forms, the remarkable organism, the Water-net, Hydrodictyon reticulatuyn, representing the highest state of organisation in the Order. The very common unicellular green alga, Pleurococcus Naegelii, Chod. (Protococcus viridis), Fig. 269, found as <. green incrustation on the windward side of tree-trunks, walls, etc., was formerly placed in this group. It is now considered to be a very reduced member of a considerably more advanced group, the Chaetophoraceae. Multiplication is by cell-division, Fig. 269, no motile stage an

. A handbook of cryptogamic botany. Cryptogams. PROrOCOCCOIDE^ 413 ovate or pear-shaped, o'02-o 025 mm. in diameter in the larger species, often apiculate or spinous at the apex. The cell-contents divide, by successive bipartitions, into zoospores, which commence swarming while still within the mother-cell, indicating'an approach to Hydrodictyon. They escape through a lateral or terminal fissure. Nearly allied to Characium are Hydrocytium A. Br., also met with in fresh water, and Hydriamim Rabh., found in similar localities. In the last genus the zoospores also escape at the apex. In Apiocysti Stock Photo

RMRE3C9E–. A handbook of cryptogamic botany. Cryptogams. PROrOCOCCOIDE^ 413 ovate or pear-shaped, o'02-o 025 mm. in diameter in the larger species, often apiculate or spinous at the apex. The cell-contents divide, by successive bipartitions, into zoospores, which commence swarming while still within the mother-cell, indicating'an approach to Hydrodictyon. They escape through a lateral or terminal fissure. Nearly allied to Characium are Hydrocytium A. Br., also met with in fresh water, and Hydriamim Rabh., found in similar localities. In the last genus the zoospores also escape at the apex. In Apiocysti

. Carnegie Institution of Washington publication. FECUNDATION ; MOTILE ISOGAMETES. Using improved methods Timberlake ('01) in a study of spore- formation in Hydrodictyon utriculatum Roth., has found that, in the earlier stages of the process, cleavage takes place by means of sm-face constrictions of the plasma membrane on the outside and the vacuolar membrane on the inside of the protoplasmic layer, as may be seen from Klebs' figures (Fig. 18, B, C). The process is a progressive one, the cleavage furrows cutting out first large irregular multinucleated masses of protoplasm, which are in turn d Stock Photo

RMRFWC97–. Carnegie Institution of Washington publication. FECUNDATION ; MOTILE ISOGAMETES. Using improved methods Timberlake ('01) in a study of spore- formation in Hydrodictyon utriculatum Roth., has found that, in the earlier stages of the process, cleavage takes place by means of sm-face constrictions of the plasma membrane on the outside and the vacuolar membrane on the inside of the protoplasmic layer, as may be seen from Klebs' figures (Fig. 18, B, C). The process is a progressive one, the cleavage furrows cutting out first large irregular multinucleated masses of protoplasm, which are in turn d

RMRDJGWT–. The elements of botany embracing organography, histology, vegetable physiology, systematic botany and economic botany ... together with a complete glossary of botanical terms. Botany. 88 HISTOLOGY AND PHYSIOLOGY. (Fig. 200), Nostoc (Fig. 201). A common example of a cell-colony, or spurious tissue, is furnished by the fresh-water Alga, Water-net (Hydrodictyon). The separate motiie cells (zoospores) into which the protoplasm breaks up arrange themselves and unite so as to form a net while yet in the mother-cell. The term tissue is used to denote a permanent union of cells. They may be united e

. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. 122 Aquatic Organisms mud after the water has receded, dotting the stirface thickly, as with greenish beads of dew. The water net and its allies—The water net {Hydro- dictyon) wherever found, is sure to attract attention by- its curious form. It is a cyUndric sheet of lace-Kke tissue, composed of slender green cells that meet at. Fig. 43. A rather irregular portion of a sheet of water net {Hydrodictyon) their ends, usually by threes, forming hexagonal meshes like bobbinet (fig Stock Photo

RMRE0CKR–. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. 122 Aquatic Organisms mud after the water has receded, dotting the stirface thickly, as with greenish beads of dew. The water net and its allies—The water net {Hydro- dictyon) wherever found, is sure to attract attention by- its curious form. It is a cyUndric sheet of lace-Kke tissue, composed of slender green cells that meet at. Fig. 43. A rather irregular portion of a sheet of water net {Hydrodictyon) their ends, usually by threes, forming hexagonal meshes like bobbinet (fig

RMRDD85W–. Botany for agricultural students . Botany. 312 THALLOPHYTES duce a new plant directly but, as in Hydrodictyon, produces a number of zoospores each of which produces a new plant. Thus, instead of one, a number of new plants arise from the zygospore, a feature of advantage in the multiplication of new plants. Another form, similar in a number of ways to Ulothrix, is Cladophora which has long branched filaments that form long, green, hair-like tufts, which, with one end anchored to a stone or some other object, wave back and forth in moving streams. The cells are multinucleate and contain many

. A textbook of botany for colleges and universities ... Botany. Fig. 45. — Hydrodictyon: arrange- ment of cells in forming the net. — After West. Fig. 46. — Hydrodictyon: zoospores within a mother cell beginning to form a net. — After Klebs.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Ci Stock Photo

RMRDXTGC–. A textbook of botany for colleges and universities ... Botany. Fig. 45. — Hydrodictyon: arrange- ment of cells in forming the net. — After West. Fig. 46. — Hydrodictyon: zoospores within a mother cell beginning to form a net. — After Klebs.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Coulter, John Merle, 1851-1928; Barnes, Charles Reid, 1858-1910, joint author; Cowles, Henry Chandler, 1869- joint author. New York, Ci

. A textbook of botany for colleges and universities ... Botany. Fig. 47. — JHydrodictyon: a. completed young net within its mother cell. — After Klebs. Figs. 4S-52. — Hydrodictyon : 48, gamete; 49, gametes fusing; 50, zygospore; 51, four zoo- spores developed by the zygospore; 52, zoospore escaped from zygospore. — 48-50, after Klebs; 51, 52, after Peingsheim. 51, 52) and develop into large, irregular, many-angled, thick-walled cells (polyhedra), which persist through the winter (fig. 53). Upon the. Please note that these images are extracted from scanned page images that may have been digita Stock Photo

RMRDXTG4–. A textbook of botany for colleges and universities ... Botany. Fig. 47. — JHydrodictyon: a. completed young net within its mother cell. — After Klebs. Figs. 4S-52. — Hydrodictyon : 48, gamete; 49, gametes fusing; 50, zygospore; 51, four zoo- spores developed by the zygospore; 52, zoospore escaped from zygospore. — 48-50, after Klebs; 51, 52, after Peingsheim. 51, 52) and develop into large, irregular, many-angled, thick-walled cells (polyhedra), which persist through the winter (fig. 53). Upon the. Please note that these images are extracted from scanned page images that may have been digita

. The algae. Algae. Rhodophyceae I? Bangia Prasiola Parenchymatous type Ulva, Enteromorpha Aerial only Draparnaldia Base only Protoderma Branched h'eterotrichous type e.g. Stigeodoniiim Phaeophyceae Conjugales. Spherical colonies Volvox net Hydrodictyon t t Colony Pediastrum Pleodorina A net (Schizodictyon) Eudorina gelatinous colonies Tetraspora type Pandorina -<- t Simple filament (Ulothrix type) A attached unicell (Characium type) A non-motile free-living unicell (Chlorella type) A primitive Ilir Chlamydomonad type (motile). Please note that these images are extracted from scanned page Stock Photo

RMRPWM6W–. The algae. Algae. Rhodophyceae I? Bangia Prasiola Parenchymatous type Ulva, Enteromorpha Aerial only Draparnaldia Base only Protoderma Branched h'eterotrichous type e.g. Stigeodoniiim Phaeophyceae Conjugales. Spherical colonies Volvox net Hydrodictyon t t Colony Pediastrum Pleodorina A net (Schizodictyon) Eudorina gelatinous colonies Tetraspora type Pandorina -<- t Simple filament (Ulothrix type) A attached unicell (Characium type) A non-motile free-living unicell (Chlorella type) A primitive Ilir Chlamydomonad type (motile). Please note that these images are extracted from scanned page

. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. 124 Aquatic Organisms meshed species the inner cells can be seen to meet by threes about the openings, quite as in the water net; but the cells are less elongate and the openings smaller. Five of the seven specimens shown in the figure lack these openings altogether. New colonies are formed within single cells, as in Hydrodictyon. In our figure certain specimens show marginal cells containing developing colonies. One shows an empty cell wall from whence a new colony has escape Stock Photo

RMRE0CKG–. The life of inland waters; an elementary text book of fresh-water biology for American students. Freshwater biology. 124 Aquatic Organisms meshed species the inner cells can be seen to meet by threes about the openings, quite as in the water net; but the cells are less elongate and the openings smaller. Five of the seven specimens shown in the figure lack these openings altogether. New colonies are formed within single cells, as in Hydrodictyon. In our figure certain specimens show marginal cells containing developing colonies. One shows an empty cell wall from whence a new colony has escape

. Botany for high schools and colleges. Botany. .234 BOTANY. 296.—Closely related to Hydrodictyon is Pediastrum (Fig. 151),which consists of a number of cells arranged into a .flat, thallus-like mass. The cells at a certain stage produce, by. Fig. 151,—A, a colony of cells conetituting a BO-called individual of Pediasirwn ^ratiulatum ; i, cells witii their contents remaining ; the white cells are empty, their contents having escaped by the elits sp: ^, contents of a cell (macrozoogonidi^ escaping. J9, macrozoogonidia g, in the motile state, enclosed in the membrane b. C^ the macrozoogonidia ar Stock Photo

RMRDWANM–. Botany for high schools and colleges. Botany. .234 BOTANY. 296.—Closely related to Hydrodictyon is Pediastrum (Fig. 151),which consists of a number of cells arranged into a .flat, thallus-like mass. The cells at a certain stage produce, by. Fig. 151,—A, a colony of cells conetituting a BO-called individual of Pediasirwn ^ratiulatum ; i, cells witii their contents remaining ; the white cells are empty, their contents having escaped by the elits sp: ^, contents of a cell (macrozoogonidi^ escaping. J9, macrozoogonidia g, in the motile state, enclosed in the membrane b. C^ the macrozoogonidia ar

. A handbook of cryptogamic botany. Cryptogams. CCENOBIE^ 297 protoplasm again breaks up into zoospores, which swarm about for twenty or forty minutes within a sac which protrudes out of the protoplasm. When they come to rest, they arrange themselves within the sac into a small net consisting of from 200 to 300 cells, which gradually grows to. Fig. 260.—Hydrodictyon idricnlatujii Roth. A, net (natural size). B^ mesh ( x lo). C, mepazoo sporange (x 300). D, megazoospores (x 600). E^ gametange with zoogameles (X 300). (After Cohn.) one of the ordinary size. In some of the polyhedra smaller and Stock Photo

RMRE3D02–. A handbook of cryptogamic botany. Cryptogams. CCENOBIE^ 297 protoplasm again breaks up into zoospores, which swarm about for twenty or forty minutes within a sac which protrudes out of the protoplasm. When they come to rest, they arrange themselves within the sac into a small net consisting of from 200 to 300 cells, which gradually grows to. Fig. 260.—Hydrodictyon idricnlatujii Roth. A, net (natural size). B^ mesh ( x lo). C, mepazoo sporange (x 300). D, megazoospores (x 600). E^ gametange with zoogameles (X 300). (After Cohn.) one of the ordinary size. In some of the polyhedra smaller and

. Botany, with agricultural applications. Botany. HYDRODICTYON 309 Pediastrum. — A more complicated colony occurs in Pedi- astrum {Fig. 264), another form common in ponds and other quiet waters in warm weather. The cells, which are quite numerous in some species, form plate-Uke colonies in which marginal cells differ in form from those within. Both zoospores and gametes are produced in this form. Any cell may form zoospores, which escape from the mother cell enclosed in a membrane and then arrange themselves into a new colony. Instead of zoospores the cells may form gametes, which. Fig. 265. — Stock Photo

RMRDWDG1–. Botany, with agricultural applications. Botany. HYDRODICTYON 309 Pediastrum. — A more complicated colony occurs in Pedi- astrum {Fig. 264), another form common in ponds and other quiet waters in warm weather. The cells, which are quite numerous in some species, form plate-Uke colonies in which marginal cells differ in form from those within. Both zoospores and gametes are produced in this form. Any cell may form zoospores, which escape from the mother cell enclosed in a membrane and then arrange themselves into a new colony. Instead of zoospores the cells may form gametes, which. Fig. 265. —

. Botany for high schools and colleges. Botany. 224 BOTANY. 296.—Closely related to Hydrodictyon is Pediastrum (Fig. 151),which consists of n number of cells arranged into a flat, thallus-like mass. The cells at a certain stage produce, by. Fig. 151.—A. a colony of cells constituting a so-called individual of Pediastrum, granulatwm ; t, cells with their contents remaining ; the white cells are empty, their contents having escaped by the slits sp: g, contents of a cell (macrozoogonidia) escaping B, macrozoogonidia g, in the motile state, enclosed in the membrane b. (7, the macrozooifonidia arra Stock Photo

RMRH8YP2–. Botany for high schools and colleges. Botany. 224 BOTANY. 296.—Closely related to Hydrodictyon is Pediastrum (Fig. 151),which consists of n number of cells arranged into a flat, thallus-like mass. The cells at a certain stage produce, by. Fig. 151.—A. a colony of cells constituting a so-called individual of Pediastrum, granulatwm ; t, cells with their contents remaining ; the white cells are empty, their contents having escaped by the slits sp: g, contents of a cell (macrozoogonidia) escaping B, macrozoogonidia g, in the motile state, enclosed in the membrane b. (7, the macrozooifonidia arra

. Carnegie Institution of Washington publication. . FIG. 18.—Cell-cleavage in Hydrodictyon utriculatum.—(After Klebs.) A, cell showing cleavage furrows at early stage in the process; «, place in protoplasm free from chlorophyll. B, sausage-shaped protoplasts formed in early stage of cleavage. C, two protoplasts similar to those in B, showing manner of further cleavage. D, final result of the cleavage. contains a single nucleus. In this manner the entire protoplast is divided into uninucleated spores or gam- etes, as the case may be. Judging from Strasburger's account of the process in Ulothrix Stock Photo

RMRFWC8P–. Carnegie Institution of Washington publication. . FIG. 18.—Cell-cleavage in Hydrodictyon utriculatum.—(After Klebs.) A, cell showing cleavage furrows at early stage in the process; «, place in protoplasm free from chlorophyll. B, sausage-shaped protoplasts formed in early stage of cleavage. C, two protoplasts similar to those in B, showing manner of further cleavage. D, final result of the cleavage. contains a single nucleus. In this manner the entire protoplast is divided into uninucleated spores or gam- etes, as the case may be. Judging from Strasburger's account of the process in Ulothrix

. Botany, with agricultural applications. Botany. 312 THALLOPHYTES duce a new plant directly but, as in Hydrodictyon, produces a number of zoospores each of which produces a new plant. Thus, instead of one, a number of new plants arise from the zygospore, a feature of advantage in the multipUcation of new plants. Another form, similar in a number of ways to Ulothrix, is Cladophora which has long branched filaments that form long, green, hair-like tufts, which, with one end anchored to a stone or some other object, wave back and forth in moving streams. The cells are multinucleate and contain m Stock Photo

RMRDWDF4–. Botany, with agricultural applications. Botany. 312 THALLOPHYTES duce a new plant directly but, as in Hydrodictyon, produces a number of zoospores each of which produces a new plant. Thus, instead of one, a number of new plants arise from the zygospore, a feature of advantage in the multipUcation of new plants. Another form, similar in a number of ways to Ulothrix, is Cladophora which has long branched filaments that form long, green, hair-like tufts, which, with one end anchored to a stone or some other object, wave back and forth in moving streams. The cells are multinucleate and contain m

. The algae. Algae. Spherical colonies Volvox net Hydrodictyon t t Colony Pediastrum Pleodorina A net (Schizodictyon) Eudorina gelatinous colonies Tetraspora type Pandorina -<- t Simple filament (Ulothrix type) A attached unicell (Characium type) A non-motile free-living unicell (Chlorella type) A primitive Ilir Chlamydomonad type (motile). Siphonaceous type (Protosiphon) Dendroid colonies e.g. Prasinocladus Scheme A The names of the genera do not necessarily imply that they formed the actual intermediate stages, but merely that forms Uke them were possibly involved. 309. Please note that Stock Photo

RMRPWM6F–. The algae. Algae. Spherical colonies Volvox net Hydrodictyon t t Colony Pediastrum Pleodorina A net (Schizodictyon) Eudorina gelatinous colonies Tetraspora type Pandorina -<- t Simple filament (Ulothrix type) A attached unicell (Characium type) A non-motile free-living unicell (Chlorella type) A primitive Ilir Chlamydomonad type (motile). Siphonaceous type (Protosiphon) Dendroid colonies e.g. Prasinocladus Scheme A The names of the genera do not necessarily imply that they formed the actual intermediate stages, but merely that forms Uke them were possibly involved. 309. Please note that

RMRDXTFX–. A textbook of botany for colleges and universities ... Botany. Fig. 47. — JHydrodictyon: a. completed young net within its mother cell. — After Klebs. Figs. 4S-52. — Hydrodictyon : 48, gamete; 49, gametes fusing; 50, zygospore; 51, four zoo- spores developed by the zygospore; 52, zoospore escaped from zygospore. — 48-50, after Klebs; 51, 52, after Peingsheim. 51, 52) and develop into large, irregular, many-angled, thick-walled cells (polyhedra), which persist through the winter (fig. 53). Upon the. Figs. 53, 54. — Hydrodictyon: sj, polyhedron formed by a zoospore; 54, young net forming withi

. Elementary botany. Botany. Fig. Pleurocuccus (protococcus) vulgaris.. Fig. 166. Pediastrum boryanum. A, mature coloTiy. most of the young colonies have escaped from their mother cells; at g, a young colon- is escaping; sp, empty mother cells; B, >-oung colony; C, same colony with spores arranged in order. (After Braun.) plants are rather common in fresh-water pools, the latter one intermingled with filamentous alg;E, while the former forms large sheets or nets. !Mul- tiplication in Hydrodictyon takes place by the pio.i ] lasm in one of the cells. Please note that these images are extract Stock Photo

RMRE2NAB–. Elementary botany. Botany. Fig. Pleurocuccus (protococcus) vulgaris.. Fig. 166. Pediastrum boryanum. A, mature coloTiy. most of the young colonies have escaped from their mother cells; at g, a young colon- is escaping; sp, empty mother cells; B, >-oung colony; C, same colony with spores arranged in order. (After Braun.) plants are rather common in fresh-water pools, the latter one intermingled with filamentous alg;E, while the former forms large sheets or nets. !Mul- tiplication in Hydrodictyon takes place by the pio.i ] lasm in one of the cells. Please note that these images are extract

. The algae. Algae. EUPHYCOPHYTA 45 sents optimum light conditions for growth of//, reticulatum, whilst the actual growing period depends upon Hght intensity, e.g. it is 3 weeks at 600-700 lux, 5J weeks at 250 lux. Under normal condi- tions growth is periodic, increasing by day and decreasing at night. This is reflected in the oxygen balance between photosynthesis and. Fig. 20 Hydrodictyon. A-F, development of young net of H. patenaeforme from the zygote. A, young polyhedron. B, older polyhedron with four nuclei. C, protoplasm granular just before zoospore formation. D, 'pavement' stage. E, zo Stock Photo

RMRPX8TD–. The algae. Algae. EUPHYCOPHYTA 45 sents optimum light conditions for growth of//, reticulatum, whilst the actual growing period depends upon Hght intensity, e.g. it is 3 weeks at 600-700 lux, 5J weeks at 250 lux. Under normal condi- tions growth is periodic, increasing by day and decreasing at night. This is reflected in the oxygen balance between photosynthesis and. Fig. 20 Hydrodictyon. A-F, development of young net of H. patenaeforme from the zygote. A, young polyhedron. B, older polyhedron with four nuclei. C, protoplasm granular just before zoospore formation. D, 'pavement' stage. E, zo

$. Botany for agricultural students. Plants. HYDRODICTYON 309 Pediastrum. — A more complicated colony occurs in Pedi- astrum {Fig. 264), another form common in ponds and other quiet waters in warm weather. The cells, which are quite numerous in some species, form plate-like colonies in which marginal cells differ in form from those within. Both zoospores and gametes are produced in this form. Any cell may form zoospores, which escape from the mother cell enclosed in a membrane and then arrange themselves into a new colony. Instead of zoospores the cells may form gametes, which. -v.t^^^ Fig. 265 Stock Photo$

RMRH8XTJ–. Botany for agricultural students. Plants. HYDRODICTYON 309 Pediastrum. — A more complicated colony occurs in Pedi- astrum {Fig. 264), another form common in ponds and other quiet waters in warm weather. The cells, which are quite numerous in some species, form plate-like colonies in which marginal cells differ in form from those within. Both zoospores and gametes are produced in this form. Any cell may form zoospores, which escape from the mother cell enclosed in a membrane and then arrange themselves into a new colony. Instead of zoospores the cells may form gametes, which. -v.t^^^ Fig. 265

RMRDD875–. Botany for agricultural students . Botany. HYDRODICTYON 309 Pediastrum. — A more complicated colony occurs in Pedi- astrum (Fig. 264), another form common in ponds and other quiet waters in warm weather. The cells, which are quite numerous in some species, form plate-like colonies in which marginal cells differ in form from those within. Both zoospores and gametes are produced in this form. Any cell may form zoospores, which escape from the mother cell enclosed in a membrane and then arrange themselves into a new colony. Instead of zoospores the cells may form gametes, which. Fig. 265. — Wat

. Abhandlungen herausgegeben vom Naturwissenschaftlichen Verein zu Bremen. Natural history; Natural history -- Germany. 28. Richteriella botryoides (Schmidle) Lemm. 29. Selenastrum Bibraianum Reinsch. 29a. Polyedrium spinulosura Schmidle. Sehr selten im August 1908. (Fig. 2.). 30. 31. 32. DW- CAAvVtoA'vi/» Xev.vvYV. 4. Hydrodictyaceae. Pediastrum Boryanum (Turp.) Menegh. P. duplex Meyen. P. biradiatum Meyen. 32a. Hydrodictyon reticulatum (L.) Lagh. Im August 1908 einige Zellen im Plankton. 5. Ulvaceae. 33. Enteromorpha intestinalis (L.) Link. 6. Chaetophoraceae. 34. Stigeoclonium tenue Kg. 35. Stock Photo

RMRR6109–. Abhandlungen herausgegeben vom Naturwissenschaftlichen Verein zu Bremen. Natural history; Natural history -- Germany. 28. Richteriella botryoides (Schmidle) Lemm. 29. Selenastrum Bibraianum Reinsch. 29a. Polyedrium spinulosura Schmidle. Sehr selten im August 1908. (Fig. 2.). 30. 31. 32. DW- CAAvVtoA'vi/» Xev.vvYV. 4. Hydrodictyaceae. Pediastrum Boryanum (Turp.) Menegh. P. duplex Meyen. P. biradiatum Meyen. 32a. Hydrodictyon reticulatum (L.) Lagh. Im August 1908 einige Zellen im Plankton. 5. Ulvaceae. 33. Enteromorpha intestinalis (L.) Link. 6. Chaetophoraceae. 34. Stigeoclonium tenue Kg. 35.

. Nature and development of plants. Botany. 184 HYDRODICTYON posed of a few loosely aggregated plants forming flat discs or star-shaped plates (Fig. 105, A). In other cases, we find spher- ical and net-like colonies. The water net, Hydrodictyop, is a common illustration of this latter arrangement (Fig. 105, D, E). These plants occur in ponds and sluggish streams, forming sac- like nets from a few inches to a foot in length, that are constructed. Fig. 105. Colonial forms of unicellular green algae: A, Pediastrum, the plants of the colony being arranged in a flat plate. B, a view of the outer ce Stock Photo

RMRE1RAB–. Nature and development of plants. Botany. 184 HYDRODICTYON posed of a few loosely aggregated plants forming flat discs or star-shaped plates (Fig. 105, A). In other cases, we find spher- ical and net-like colonies. The water net, Hydrodictyop, is a common illustration of this latter arrangement (Fig. 105, D, E). These plants occur in ponds and sluggish streams, forming sac- like nets from a few inches to a foot in length, that are constructed. Fig. 105. Colonial forms of unicellular green algae: A, Pediastrum, the plants of the colony being arranged in a flat plate. B, a view of the outer ce

RMRDWGB2–. Nature and development of plants. Botany. 184 HYDRODICTYON posed of a few loosely aggregated plants forming flat discs or star-shaped plates (Fig. 105, A). In other cases, we find spher- ical and net-like colonies. The water net, Hydrodictyon, is a common illustration of this latter arrangement (Fig. 105, D, E). These plants occur in ponds and sluggish streams, forming sac- like nets from a few inches to a foot in length, that are constructed. Fig. 105. Colonial forms of unicellular green algae: A, Pediasirum, the plants of the colony being arranged in a flat plate. B, a view of the outer ce

. Botanische Zeitung. Plants; Plants. — 44 — mit einer homogenen Schicht, welche sich bei einer späteren Theilung gleich verhält, wie die Gallerthülle der Zelle, von der wir ausgegangen sind. Diese freien Tochterzellen wurden wohl nur von Borzi (91) beobachtet; er gab sie aber sofort als bewegliche, den Schwärmern von Hydrodictyon oder Pediästrum analoge Zoosporen aus. Dangeard (89) glaubte, es könnten nur dadurch einzelne Zellen von Colouien frei werden, dass die verbindenden Gallertarme reissen. Wird die Zelle durch äussere Einflüsse dazu veranlasst, bei der Theilung die Tochter- individuen Stock Photo

RMRH9PK2–. Botanische Zeitung. Plants; Plants. — 44 — mit einer homogenen Schicht, welche sich bei einer späteren Theilung gleich verhält, wie die Gallerthülle der Zelle, von der wir ausgegangen sind. Diese freien Tochterzellen wurden wohl nur von Borzi (91) beobachtet; er gab sie aber sofort als bewegliche, den Schwärmern von Hydrodictyon oder Pediästrum analoge Zoosporen aus. Dangeard (89) glaubte, es könnten nur dadurch einzelne Zellen von Colouien frei werden, dass die verbindenden Gallertarme reissen. Wird die Zelle durch äussere Einflüsse dazu veranlasst, bei der Theilung die Tochter- individuen

. BlÃ¤tter fÃ¼r Aquarien- und Terrarien-Kunde. . Jahrgang XVI. Heft 1. SÃ¼Ãwasser-Algen. Original-Mikrophotographien fÃ¼r die BlÃ¤tter 1. Draparnaldia plumosa Ag. 1801. 3. Volvox globator Ehrbg. 601. 5. Spirogyra longata Kg. 180/1. 2. Hydrodictyon reticulatum Lagerh. 60/1. 4. Chaetophora pisiformis Ag. 150/1. 6. Zygnema cruciatum Ag. 325/1. BlÃ¤tter fÃ¼r Aquarien- u. Terr.irien â Kunde. Creutz'sche Verlagsbuchhandlung (M. Kretschmann) Magdeburg.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc Stock Photo

RMRHHCB0–. BlÃ¤tter fÃ¼r Aquarien- und Terrarien-Kunde. . Jahrgang XVI. Heft 1. SÃ¼Ãwasser-Algen. Original-Mikrophotographien fÃ¼r die BlÃ¤tter 1. Draparnaldia plumosa Ag. 1801. 3. Volvox globator Ehrbg. 601. 5. Spirogyra longata Kg. 180/1. 2. Hydrodictyon reticulatum Lagerh. 60/1. 4. Chaetophora pisiformis Ag. 150/1. 6. Zygnema cruciatum Ag. 325/1. BlÃ¤tter fÃ¼r Aquarien- u. Terr.irien â Kunde. Creutz'sche Verlagsbuchhandlung (M. Kretschmann) Magdeburg.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearanc

. Botanique cryptogamique, ou Histoire des familles naturelles des plantes infrieures. 91. N'OStoc verrucosuin.. 89. Palmella cruent3. 90 Hydrodictyon utriculatum. 92. Zygnema cruciata. 93. Staurocarpus gracilis. 4Â° Les .NostochinÃ©es sont des filaments composÃ©s d'utricules placÃ©es bout Ã bout. A l'Ã©poque de1 la maturitÃ©, chaque utricule se divise en deux par une cloison longitudinale double, en sorte que le filament offre deux sÃ©ries d'utricules au lieu d'une. Mais bientÃ´t ces deux sÃ©ries se sÃ©parent et constituent chacune un nouvel individu. 5Â° Les ZygnenÃ©es sont Ã©galement des tu Stock Photo

RMRH9YNE–. Botanique cryptogamique, ou Histoire des familles naturelles des plantes infrieures. 91. N'OStoc verrucosuin.. 89. Palmella cruent3. 90 Hydrodictyon utriculatum. 92. Zygnema cruciata. 93. Staurocarpus gracilis. 4Â° Les .NostochinÃ©es sont des filaments composÃ©s d'utricules placÃ©es bout Ã bout. A l'Ã©poque de1 la maturitÃ©, chaque utricule se divise en deux par une cloison longitudinale double, en sorte que le filament offre deux sÃ©ries d'utricules au lieu d'une. Mais bientÃ´t ces deux sÃ©ries se sÃ©parent et constituent chacune un nouvel individu. 5Â° Les ZygnenÃ©es sont Ã©galement des tu

. Beihefte zum botanischen Centralblatt. Plants. Teodoresco, Matdriaux pour la flore algologique de la Roumanie. 135 Hydrodictyon Roth, Hydrodictyon reticulatum (L.) Lagerh.; Klebs, Beding, d. Fort- pflanz, bei einig. Alg. u. Pilzen, flg. 4. Ilfov: fosses et canaux de la Colintina ä Baneasa, Aoüt (21); fosse entre Cotroceni et Dealul-Spirei, Avr. (148); mares de la vallee de la Colintina ä Chitila, Mai (761); fosses de la route entre Tancabesti et Bratulesti, Juin (775); fosses de la Dämbovita ä Bucarest-Vacaresti, Juin (783); mares de la vallee du Sabaru ä Jilava, Oct. (810). — Vlasca: mares Stock Photo

RMRHY4EA–. Beihefte zum botanischen Centralblatt. Plants. Teodoresco, Matdriaux pour la flore algologique de la Roumanie. 135 Hydrodictyon Roth, Hydrodictyon reticulatum (L.) Lagerh.; Klebs, Beding, d. Fort- pflanz, bei einig. Alg. u. Pilzen, flg. 4. Ilfov: fosses et canaux de la Colintina ä Baneasa, Aoüt (21); fosse entre Cotroceni et Dealul-Spirei, Avr. (148); mares de la vallee de la Colintina ä Chitila, Mai (761); fosses de la route entre Tancabesti et Bratulesti, Juin (775); fosses de la Dämbovita ä Bucarest-Vacaresti, Juin (783); mares de la vallee du Sabaru ä Jilava, Oct. (810). — Vlasca: mares

. Beitrge zur Kryptogamenflora der Schweiz. 237 repos en 2-4 zoospores grosses, biciliees qui, apres repos, se transforment en polyedres qui germeront en produisant, apres division repetee du contenu, un reseau typique. Hydrodictyon reticulatum (L.) Lagerh. Bidrag tili Sverig. Algflora, 71 ; Conferva reticulata L. Spec. plant., 1635 ; Hydrodictyon pentagonum Taucher Hist. des Conferves, 88,. t. I, tg. 4; De Toni, Sylloge, 562. Cenobe de 5 dm. ou plus grand 6u plus petit, 8-10 cm. large ; cel- lules 3—10 mm. de longueur, 0,1—0,2 mm, larg. ; zoospores 10^8 ^., gametes 5—8 »x. = 3—6 ]x. Autrefoi Stock Photo

RMRHT37N–. Beitrge zur Kryptogamenflora der Schweiz. 237 repos en 2-4 zoospores grosses, biciliees qui, apres repos, se transforment en polyedres qui germeront en produisant, apres division repetee du contenu, un reseau typique. Hydrodictyon reticulatum (L.) Lagerh. Bidrag tili Sverig. Algflora, 71 ; Conferva reticulata L. Spec. plant., 1635 ; Hydrodictyon pentagonum Taucher Hist. des Conferves, 88,. t. I, tg. 4; De Toni, Sylloge, 562. Cenobe de 5 dm. ou plus grand 6u plus petit, 8-10 cm. large ; cel- lules 3—10 mm. de longueur, 0,1—0,2 mm, larg. ; zoospores 10^8 ^., gametes 5—8 »x. = 3—6 ]x. Autrefoi

. Bulletin Societe D'Histoire Naturelle de Toulouse (et de Midi Pyrenees).. 76 Explication des figures de la planche. Fig. i. â Hydrodictyon utriculatum de Roth (d'aprÃ¨s Woole). Fig. a. â Le mÃªme (d'aprÃ¨s un dessin Ã la chambre claire, 450 D.). Fig. 4. â Le mÃªme. Etat de dÃ©veloppement plus avancÃ©. Fig. 3 et 5. â Le mÃªme, d'aprÃ¨s Vaucher (la fig. 3 reprÃ©sente les cÃ´tÃ©s grossis au moment de se sÃ©parer), Fig. 6. â Hydrodictyon fÃ©morale, d'aprÃ¨s la figure d'Arrondeau. Fig. 7. â Hydrodictyon utriculatum (d'aprÃ¨s Cooke). AR. 1904. Please note that these images are extracted from scann Stock Photo

RMRG9J3W–. Bulletin Societe D'Histoire Naturelle de Toulouse (et de Midi Pyrenees).. 76 Explication des figures de la planche. Fig. i. â Hydrodictyon utriculatum de Roth (d'aprÃ¨s Woole). Fig. a. â Le mÃªme (d'aprÃ¨s un dessin Ã la chambre claire, 450 D.). Fig. 4. â Le mÃªme. Etat de dÃ©veloppement plus avancÃ©. Fig. 3 et 5. â Le mÃªme, d'aprÃ¨s Vaucher (la fig. 3 reprÃ©sente les cÃ´tÃ©s grossis au moment de se sÃ©parer), Fig. 6. â Hydrodictyon fÃ©morale, d'aprÃ¨s la figure d'Arrondeau. Fig. 7. â Hydrodictyon utriculatum (d'aprÃ¨s Cooke). AR. 1904. Please note that these images are extracted from scann

RMRCHRR6–. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet. Botany. Chytridineae. (Schröter.) 79 20—25 f.1 breit, durch eine warzenförmige Mündung am Scheitel sich öffnend, am Grunde in einen feinen Mycelschlauch übergehend, welcher sich in die Nährzelle einsenkt und am Ende in eine kugelige Blase anschwillt. Schwärmsporen kugelig. Gesellig an den Zellen von Hydrodictyon utriculatum. — Ph. catenalum (Dangeard) Schrot. Sporangien birnförmig, mit breitem, kurz warzenförmigem Sc

. Die Bedingungen der Fortpflanzung bei einigen Algen und Pilzen. 134. Fig;. 4. Hydrodictyon utriculatum. Ä ein Stück eines Netzes; B eine Zelle mit einem eben gebildeten Netz innerhalb der stark aufgequollenen Zelhvand; C eine Anzahl Zoosporen mit einander verbunden (in dieser Gruppierung sich auch bewegend), die drei nach der Mitte gerichteten Zoosporen der Deutlichkeit wegen ohne Cilien gezeichnet; D eine einzelne Gamete; E Kopulation zweier Gameten; i^'eine Zygote. Vergr. von A und B 120, C—E 1000.. Please note that these images are extracted from scanned page images that may have been dig Stock Photo

RMRCNR4A–. Die Bedingungen der Fortpflanzung bei einigen Algen und Pilzen. 134. Fig;. 4. Hydrodictyon utriculatum. Ä ein Stück eines Netzes; B eine Zelle mit einem eben gebildeten Netz innerhalb der stark aufgequollenen Zelhvand; C eine Anzahl Zoosporen mit einander verbunden (in dieser Gruppierung sich auch bewegend), die drei nach der Mitte gerichteten Zoosporen der Deutlichkeit wegen ohne Cilien gezeichnet; D eine einzelne Gamete; E Kopulation zweier Gameten; i^'eine Zygote. Vergr. von A und B 120, C—E 1000.. Please note that these images are extracted from scanned page images that may have been dig

Hydrodictyon Stock Photos and Images

Hydrodictyon Stock Photos and Images

Download Confirmation

Password Confirmation

Search Results for Hydrodictyon Stock Photos and Images (87)

Filter by agency collections

Search builder

Get great features with your free account

Get inspired for your next project!