Desmid Black and White Stock Photos & Images

RFAA1M3D–Closterium Desmid

Conjugation stages of desmid algae, vintage line drawing or engraving illustration. Stock Vector

RF2BTGK71–Conjugation stages of desmid algae, vintage line drawing or engraving illustration.

Micrograph of two empty Staurastrum desmid alga cells, field of view is approximately 118 microns wide Stock Photo

RM2A9P43F–Micrograph of two empty Staurastrum desmid alga cells, field of view is approximately 118 microns wide

Micrasterias angulosa, Algae, SEM Stock Photo

RMHRF8J0–Micrasterias angulosa, Algae, SEM

It is a single celled green algae, vintage line drawing or engraving illustration. Stock Vector

RF2BTGJ79–It is a single celled green algae, vintage line drawing or engraving illustration.

. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. THALLOPHYTA. 655 DesTmdioidecB.—The Desmids are a large family of fresh-water forms numbering over a thousand species. Perhaps their most favourite habitat in this country is the water which collects and stands between mosses and similar plants on imper- vious soils. Many of the Desmids are among the most beautiful of algal forms. The great characteristic of the Desmid-cell is its almost invariable division into two symmetrical halves, often separated by a circular constriction {of. fig. 372). The ce Stock Photo

RMPG1RGF–. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. THALLOPHYTA. 655 DesTmdioidecB.—The Desmids are a large family of fresh-water forms numbering over a thousand species. Perhaps their most favourite habitat in this country is the water which collects and stands between mosses and similar plants on imper- vious soils. Many of the Desmids are among the most beautiful of algal forms. The great characteristic of the Desmid-cell is its almost invariable division into two symmetrical halves, often separated by a circular constriction {of. fig. 372). The ce

RMRDGANY–. The natural history of plants, their forms, growth, reproduction, and distribution;. Botany. THALLOPHYTA. 655 DesTmdioidecB.—The Desmids are a large family of fresh-water forms numbering over a thousand species. Perhaps their most favourite habitat in this country is the water which collects and stands between mosses and similar plants on imper- vious soils. Many of the Desmids are among the most beautiful of algal forms. The great characteristic of the Desmid-cell is its almost invariable division into two symmetrical halves, often separated by a circular constriction {of. fig. 372). The ce

. The essentials of botany. Botany. ZTGOfHTTA. 121 â wHioh it does by bursting its wall and dividing its con- tents into two parts, each of which finally becomes a new desmid {g, h, i). 254. The Diatoms {DiatomaoeaB) are microscopic uni- cellular water-plants, resembling the Desmids, but differ- ing from them in having walls which are silicified, and in the chlorophyll being hidden by the presence of a yellow coloring matter (phycoxanthine). Each Cell is usually composed of two similar portions, called the valves. Each valve may be described as a disk whose edge is turned down all around, so a Stock Photo

RMPG3RYB–. The essentials of botany. Botany. ZTGOfHTTA. 121 â wHioh it does by bursting its wall and dividing its con- tents into two parts, each of which finally becomes a new desmid {g, h, i). 254. The Diatoms {DiatomaoeaB) are microscopic uni- cellular water-plants, resembling the Desmids, but differ- ing from them in having walls which are silicified, and in the chlorophyll being hidden by the presence of a yellow coloring matter (phycoxanthine). Each Cell is usually composed of two similar portions, called the valves. Each valve may be described as a disk whose edge is turned down all around, so a

. A handbook of cryptogamic botany. Cryptogams. 27o ALG.-E formation, during the motion, of a filament of mucilage by which the â desmid is temporarily attached to the bottom, and which gradually lengthens. The movements of desmids are especially vigorous when they are in the act of dividing. Stahl found that, like the movements of zoospores, they are affected by light. Vegetative propagation takes place by division or fission, a process which can be easily followed out in species of Cosmarium or Staurastrum, the whole being completed in the course of a few hours. When cell- division is about Stock Photo

RMRE3D3H–. A handbook of cryptogamic botany. Cryptogams. 27o ALG.-E formation, during the motion, of a filament of mucilage by which the â desmid is temporarily attached to the bottom, and which gradually lengthens. The movements of desmids are especially vigorous when they are in the act of dividing. Stahl found that, like the movements of zoospores, they are affected by light. Vegetative propagation takes place by division or fission, a process which can be easily followed out in species of Cosmarium or Staurastrum, the whole being completed in the course of a few hours. When cell- division is about

. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 20 A Canadian Arctic Expedition, 1913-1918 Penium spirostriolatum Barker (Plate III, fig. 6) A few individuals of this beautiful desmid occurred in the Hippuris swamp at Herschel island. It also has not been previously recorded from arctic America. Closteriutn Nitzsch. Closterium Cornu Ehrenb. (Plate IV, fig. 16) This was a very common species from the tundra pond and the pond between the lake and sea at Teller. It was found also on Pihumalerksiak island (Cockburn point). The majority of specimens were more curved then Stock Photo

RMPG2WTG–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 20 A Canadian Arctic Expedition, 1913-1918 Penium spirostriolatum Barker (Plate III, fig. 6) A few individuals of this beautiful desmid occurred in the Hippuris swamp at Herschel island. It also has not been previously recorded from arctic America. Closteriutn Nitzsch. Closterium Cornu Ehrenb. (Plate IV, fig. 16) This was a very common species from the tundra pond and the pond between the lake and sea at Teller. It was found also on Pihumalerksiak island (Cockburn point). The majority of specimens were more curved then

. Minute marvels of nature, being some revelations of the microscope, exhibited by photomicrographs taken by the author. Natural history; Microscopes. THE BEGINNINGS OF PLANT LIFE 7 living- substance of the cell or plant. As these plant cells all show more or less clearly a line ot division in the middle, they might seem to be two separate cells joined together ; but such is not the case, each desmid being but one cell. When reproduction is about to take place, the. Fig. 3. Other forms of desmids, chiefly Micras- teruu deiilindata. Actvial length about fj, of an inch contents of the cell divi Stock Photo

RMRDP7AY–. Minute marvels of nature, being some revelations of the microscope, exhibited by photomicrographs taken by the author. Natural history; Microscopes. THE BEGINNINGS OF PLANT LIFE 7 living- substance of the cell or plant. As these plant cells all show more or less clearly a line ot division in the middle, they might seem to be two separate cells joined together ; but such is not the case, each desmid being but one cell. When reproduction is about to take place, the. Fig. 3. Other forms of desmids, chiefly Micras- teruu deiilindata. Actvial length about fj, of an inch contents of the cell divi

. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 32 a Canadian Arctic Expedition^, 1913-1918 Hyalotheca mucosa (Mert.) Ralfs . (Text fig. 6) This desmid with its enormously wide sheath, was fairly common in one of the tundra ponds at Teller. A few small fragments were also found in the material from Herschel island. It is a species common in the warmer temperate regions and I do not think it has been recorded before from arctic waters. Diameter of sheath lOO-llO/i, diameter of cells 15ai, length of cells 18-20^.. Fig. 6. Hyalotheca mucosa (Mert.) Ralfs. A photomicrog Stock Photo

RMPG2WBD–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 32 a Canadian Arctic Expedition^, 1913-1918 Hyalotheca mucosa (Mert.) Ralfs . (Text fig. 6) This desmid with its enormously wide sheath, was fairly common in one of the tundra ponds at Teller. A few small fragments were also found in the material from Herschel island. It is a species common in the warmer temperate regions and I do not think it has been recorded before from arctic waters. Diameter of sheath lOO-llO/i, diameter of cells 15ai, length of cells 18-20^.. Fig. 6. Hyalotheca mucosa (Mert.) Ralfs. A photomicrog

. The essentials of botany. Botany. ZTOOPHYTA. 121 which it does by bursting its wall and dividing its con- tents into two parts, each of which finally becomes a new desmid {g, h, i). 254. The Diatoms {Diatomacem) are microscopic uni- cellular water-plants, resembling the Desmids, but differ- ing from them in having walls which are silicified, and in the chlorophyll being hidden by the presence of a yellow coloring matter (phycoxanthine). Each cell is usually composed of two similar portions, called the valves. Each valve may be described as a disk whose edge is turned down all around, so as t Stock Photo

RMRDWC1R–. The essentials of botany. Botany. ZTOOPHYTA. 121 which it does by bursting its wall and dividing its con- tents into two parts, each of which finally becomes a new desmid {g, h, i). 254. The Diatoms {Diatomacem) are microscopic uni- cellular water-plants, resembling the Desmids, but differ- ing from them in having walls which are silicified, and in the chlorophyll being hidden by the presence of a yellow coloring matter (phycoxanthine). Each cell is usually composed of two similar portions, called the valves. Each valve may be described as a disk whose edge is turned down all around, so as t

. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 26 A Canadian Arctic Expedition, 1913—1918 areas form two groups—a polar group of 12-14 areas and a band next to the sinus of 18-22 areas, 7-11 seen on one side. Each elevated area, from smus to pole, bears 4-5 pairs of scrobiculations and often an unpaired terminal one. This is a peculiar type of desmid without any close relation to other species. In possessing canal-like depression with scrobiculate elevated areas it is distinct from other species of this genus. Only a few plants were seen in the material collected f Stock Photo

RMPG2WRE–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 26 A Canadian Arctic Expedition, 1913—1918 areas form two groups—a polar group of 12-14 areas and a band next to the sinus of 18-22 areas, 7-11 seen on one side. Each elevated area, from smus to pole, bears 4-5 pairs of scrobiculations and often an unpaired terminal one. This is a peculiar type of desmid without any close relation to other species. In possessing canal-like depression with scrobiculate elevated areas it is distinct from other species of this genus. Only a few plants were seen in the material collected f

. Botany of the living plant. Botany. Fig. 33.S. Germination of a Desmid, Closteriiim, after Klebaha. i, zygote before nuclear fusion; 2, first nuclear division: 3, binuclear stage; 4, second nuclear division; 5, two cells, eacti with a small and a large nucleus. 6, formation of two new Closkrium cells each with one large iniclcus ; the other is disorganised. {From Oltmanns.) Their protoplasts contract, one earlier than the other ; it then passes bodily through the now open tube, and its cytoplasm coalesces with that of the other cell, while its chloroplast disorganises (Fig. 337). The nuclei Stock Photo

RMRDXNY0–. Botany of the living plant. Botany. Fig. 33.S. Germination of a Desmid, Closteriiim, after Klebaha. i, zygote before nuclear fusion; 2, first nuclear division: 3, binuclear stage; 4, second nuclear division; 5, two cells, eacti with a small and a large nucleus. 6, formation of two new Closkrium cells each with one large iniclcus ; the other is disorganised. {From Oltmanns.) Their protoplasts contract, one earlier than the other ; it then passes bodily through the now open tube, and its cytoplasm coalesces with that of the other cell, while its chloroplast disorganises (Fig. 337). The nuclei

. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. B^r h c. Siaurastrum Holmii nov. comb. [Cosmarium Holmii Wille). A, B, Cand D drawings of specimens found by the C. A. E. showing variations in shape from a two-sided form to a four-sided form. E reproduction of Wille's figures; all X 500; a, face view, 6, side view, c, end view. Staurastrutn Holmii (Wille) nov. comb. Cosmarium Holmii Wille. (Text fig. 5) This desmid was first described by Wille in the report of the Dijmphna- Expedition of 1882^. In his description he states: "This species occupies a rather separa Stock Photo

RMPG2WCF–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. B^r h c. Siaurastrum Holmii nov. comb. [Cosmarium Holmii Wille). A, B, Cand D drawings of specimens found by the C. A. E. showing variations in shape from a two-sided form to a four-sided form. E reproduction of Wille's figures; all X 500; a, face view, 6, side view, c, end view. Staurastrutn Holmii (Wille) nov. comb. Cosmarium Holmii Wille. (Text fig. 5) This desmid was first described by Wille in the report of the Dijmphna- Expedition of 1882^. In his description he states: "This species occupies a rather separa

. The essentials of botany. Botany. 140 BOTANY. resting spore (e), which soon becomes coated with a thick wall (/). After a longer or shorter time the resting spore may germinate, which it does by bursting its wall and di- viding its contents into two parts, each of which finally becomes a new desmid {g, li, i). 246. The Diatoms {Diatomacece) are microscopic uni- cellular water-plants, resembling the desmids, but differ- ing from them in having walls which are silicified, and in the chlorophyll being hidden by the presence of a yellow coloring matter (phycoxanthin). Each cell is usti- ally com Stock Photo

RMRDYC97–. The essentials of botany. Botany. 140 BOTANY. resting spore (e), which soon becomes coated with a thick wall (/). After a longer or shorter time the resting spore may germinate, which it does by bursting its wall and di- viding its contents into two parts, each of which finally becomes a new desmid {g, li, i). 246. The Diatoms {Diatomacece) are microscopic uni- cellular water-plants, resembling the desmids, but differ- ing from them in having walls which are silicified, and in the chlorophyll being hidden by the presence of a yellow coloring matter (phycoxanthin). Each cell is usti- ally com

. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Freshwater Algae and Diatoms 47 a Plate II. nm/mftmumi 8MÂ»r,."-rrÂ» ui...JLUj^. Fig. 1. Large lake at Konganevik, Camden bay. Note the broad belt in the foreground of aquatic flowering plants. July, 1914. Photo F. Johansen. â¢ .^>..,,,,' "iH dw*/^-^ ^ ;. .i> â -â 'â 'â ,,' '^mI^ i*^^^ tt ^Im Fig. 2. Pond overgrown with Hippuris, Eriophorum, Carex, etc., inland on Herschel island, from this swamp that the comparatively rich desmid flora was secured. July, 1916. F. Johansen. It was Photo. Please note tha Stock Photo

RMPG2WE6–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Freshwater Algae and Diatoms 47 a Plate II. nm/mftmumi 8MÂ»r,."-rrÂ» ui...JLUj^. Fig. 1. Large lake at Konganevik, Camden bay. Note the broad belt in the foreground of aquatic flowering plants. July, 1914. Photo F. Johansen. â¢ .^>..,,,,' "iH dw*/^-^ ^ ;. .i> â -â 'â 'â ,,' '^mI^ i*^^^ tt ^Im Fig. 2. Pond overgrown with Hippuris, Eriophorum, Carex, etc., inland on Herschel island, from this swamp that the comparatively rich desmid flora was secured. July, 1916. F. Johansen. It was Photo. Please note tha

RMRDBY82–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 20 A Canadian Arctic Expedition, 1913-1918 Penium spirostriolatum Barker (Plate III, fig. 6) A few individuals of this beautiful desmid occurred in the Hippuris swamp at Herschel island. It also has not been previously recorded from arctic America. Closteriutn Nitzsch. Closterium Cornu Ehrenb. (Plate IV, fig. 16) This was a very common species from the tundra pond and the pond between the lake and sea at Teller. It was found also on Pihumalerksiak island (Cockburn point). The majority of specimens were more curved then

RMRDJH7M–. The essentials of botany. Botany. ZTGOfHTTA. 121 â wHioh it does by bursting its wall and dividing its con- tents into two parts, each of which finally becomes a new desmid {g, h, i). 254. The Diatoms {DiatomaoeaB) are microscopic uni- cellular water-plants, resembling the Desmids, but differ- ing from them in having walls which are silicified, and in the chlorophyll being hidden by the presence of a yellow coloring matter (phycoxanthine). Each Cell is usually composed of two similar portions, called the valves. Each valve may be described as a disk whose edge is turned down all around, so a

. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. 190 MANUAL OF POISONOUS PLANTS. / I Fig. 32a. Lower figure, two views of diatom. m lateral view; / upper view. Upper figure, a desmid Closterium; chl—choroplastid. Charlotte M. King. 1 or more spiral bands, depending upon the species; nucleus is generally situated in the central portion of the cell; in the chlorophyll band occur what are known as the pyrenoids; reproduction both asexual, by the simple cutting off of the end cell, and Stock Photo

RMRDYE7R–. A manual of poisonous plants, chiefly of eastern North America, with brief notes on economic and medicinal plants, and numerous illustrations. Poisonous plants. 190 MANUAL OF POISONOUS PLANTS. / I Fig. 32a. Lower figure, two views of diatom. m lateral view; / upper view. Upper figure, a desmid Closterium; chl—choroplastid. Charlotte M. King. 1 or more spiral bands, depending upon the species; nucleus is generally situated in the central portion of the cell; in the chlorophyll band occur what are known as the pyrenoids; reproduction both asexual, by the simple cutting off of the end cell, and

$. Plants and their uses; an introduction to botany. Botany; Botany, Economic. THE CiREEN ALUM 477. Fiu. 307.—Wall-stain Alga {Plcurococcus vuloaris. Wall-stain Family, Plcurococcacece).^ Plants showing fission in various directions, ^t"- (Willi;.)—Growing commonly upon moist rocks, bricks, and tree- trunks, forming extensive green-stains, throughout the world. Fig. 308.—Grape Desmid {Cosmarium Botrys, Desmid Family, Desmidiacew.) I-III, stages of fission, ^l". (DeBary.)—Bright green. Common in fresh water.. Please note that these images are extracted from scanned page images that may Stock Photo$

RMRE0THP–. Plants and their uses; an introduction to botany. Botany; Botany, Economic. THE CiREEN ALUM 477. Fiu. 307.—Wall-stain Alga {Plcurococcus vuloaris. Wall-stain Family, Plcurococcacece).^ Plants showing fission in various directions, ^t"- (Willi;.)—Growing commonly upon moist rocks, bricks, and tree- trunks, forming extensive green-stains, throughout the world. Fig. 308.—Grape Desmid {Cosmarium Botrys, Desmid Family, Desmidiacew.) I-III, stages of fission, ^l". (DeBary.)—Bright green. Common in fresh water.. Please note that these images are extracted from scanned page images that may

. Botany. Part A [microform] : freshwater algae and freshwater diatoms. Canadian Arctic Expedition (1913-1918); Canadian Arctic Expedition (1913-1918); Algues d'eau douce; Diatoms; Freshwater algae; Diatomées. 20 a Canadian Arctic Expedition, 1913-191S Penium spirostriolatum Barker (Plate III, fip. (J) A fpw individuals of this beautiful desmid occurred in the Hiiipurii' swamp at Herschcl island. It also has not been previously recorded from arctic America. Closterium Nitzsch. Closterium Cornu Ehrenb. (Plate IV, fig. Itt) This was a very common species from the tuiidia pond and the pond betwee Stock Photo

RMRENJ6A–. Botany. Part A [microform] : freshwater algae and freshwater diatoms. Canadian Arctic Expedition (1913-1918); Canadian Arctic Expedition (1913-1918); Algues d'eau douce; Diatoms; Freshwater algae; Diatomées. 20 a Canadian Arctic Expedition, 1913-191S Penium spirostriolatum Barker (Plate III, fip. (J) A fpw individuals of this beautiful desmid occurred in the Hiiipurii' swamp at Herschcl island. It also has not been previously recorded from arctic America. Closterium Nitzsch. Closterium Cornu Ehrenb. (Plate IV, fig. Itt) This was a very common species from the tuiidia pond and the pond betwee

$. Plants and their uses; an introduction to botany. Botany; Botany, Economic. Fiu. 307.—Wall-stain Alga {Plcurococcus vuloaris. Wall-stain Family, Plcurococcacece).^ Plants showing fission in various directions, ^t"- (Willi;.)—Growing commonly upon moist rocks, bricks, and tree- trunks, forming extensive green-stains, throughout the world. Fig. 308.—Grape Desmid {Cosmarium Botrys, Desmid Family, Desmidiacew.) I-III, stages of fission, ^l". (DeBary.)—Bright green. Common in fresh water.. Fig. 309.—Grape Desmid. .1, first stage in conjugation; the two halves of the celi-wall (6) have b Stock Photo$

RMRE0THJ–. Plants and their uses; an introduction to botany. Botany; Botany, Economic. Fiu. 307.—Wall-stain Alga {Plcurococcus vuloaris. Wall-stain Family, Plcurococcacece).^ Plants showing fission in various directions, ^t"- (Willi;.)—Growing commonly upon moist rocks, bricks, and tree- trunks, forming extensive green-stains, throughout the world. Fig. 308.—Grape Desmid {Cosmarium Botrys, Desmid Family, Desmidiacew.) I-III, stages of fission, ^l". (DeBary.)—Bright green. Common in fresh water.. Fig. 309.—Grape Desmid. .1, first stage in conjugation; the two halves of the celi-wall (6) have b

RMRDEBWE–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 32 a Canadian Arctic Expedition^, 1913-1918 Hyalotheca mucosa (Mert.) Ralfs . (Text fig. 6) This desmid with its enormously wide sheath, was fairly common in one of the tundra ponds at Teller. A few small fragments were also found in the material from Herschel island. It is a species common in the warmer temperate regions and I do not think it has been recorded before from arctic waters. Diameter of sheath lOO-llO/i, diameter of cells 15ai, length of cells 18-20^.. Fig. 6. Hyalotheca mucosa (Mert.) Ralfs. A photomicrog

RMRDD4FK–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. 26 A Canadian Arctic Expedition, 1913—1918 areas form two groups—a polar group of 12-14 areas and a band next to the sinus of 18-22 areas, 7-11 seen on one side. Each elevated area, from smus to pole, bears 4-5 pairs of scrobiculations and often an unpaired terminal one. This is a peculiar type of desmid without any close relation to other species. In possessing canal-like depression with scrobiculate elevated areas it is distinct from other species of this genus. Only a few plants were seen in the material collected f

RMRDEBW6–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. Freshwater Algae and Diatoms 47 a Plate II. nm/mftmumi 8MÂ»r,."-rrÂ» ui...JLUj^. Fig. 1. Large lake at Konganevik, Camden bay. Note the broad belt in the foreground of aquatic flowering plants. July, 1914. Photo F. Johansen. â¢ .^>..,,,,' "iH dw*/^-^ ^ ;. .i> â -â 'â 'â ,,' '^mI^ i*^^^ tt ^Im Fig. 2. Pond overgrown with Hippuris, Eriophorum, Carex, etc., inland on Herschel island, from this swamp that the comparatively rich desmid flora was secured. July, 1916. F. Johansen. It was Photo. Please note tha

RMRDD4F9–. Report of the Canadian Arctic Expedition 1913-18. Scientific expeditions. B^r h c. Siaurastrum Holmii nov. comb. [Cosmarium Holmii Wille). A, B, Cand D drawings of specimens found by the C. A. E. showing variations in shape from a two-sided form to a four-sided form. E reproduction of Wille's figures; all X 500; a, face view, 6, side view, c, end view. Staurastrutn Holmii (Wille) nov. comb. Cosmarium Holmii Wille. (Text fig. 5) This desmid was first described by Wille in the report of the Dijmphna- Expedition of 1882^. In his description he states: "This species occupies a rather separa

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