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Gametangium Stock Photos and Images

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Stonewort (Chara virgata, Chara delicatula), with gametangia, Germany Stock Photo
RMEBKBFC–Stonewort (Chara virgata, Chara delicatula), with gametangia, Germany
Chara virgata, delicate stonewort alga with gametangia submerged in a clear-watered lake. Stock Photo
RFR9B67C–Chara virgata, delicate stonewort alga with gametangia submerged in a clear-watered lake.
Nature and development of plants . he female gamete is sometimescalled the oosphere or egg. The female gamete presents essen-tially the same characteristics as seen in many of the algae, asVaucheria, Oedogonium, etc., but it is surrounded by a jacket ofcells which constitute the basal portion of the archegonium in-stead of being contained in a single cell. Possibly the archego-nium has come about from a multicellular gametangium, as seenin the brown algae, owing to the sterilization of all but one ofthe cells. Archegonia, with two or more gamete-like cells, aresometimes found in the mosses and Stock Photo
RM2AXH780–Nature and development of plants . he female gamete is sometimescalled the oosphere or egg. The female gamete presents essen-tially the same characteristics as seen in many of the algae, asVaucheria, Oedogonium, etc., but it is surrounded by a jacket ofcells which constitute the basal portion of the archegonium in-stead of being contained in a single cell. Possibly the archego-nium has come about from a multicellular gametangium, as seenin the brown algae, owing to the sterilization of all but one ofthe cells. Archegonia, with two or more gamete-like cells, aresometimes found in the mosses and
. Botany for agricultural students . Botany. ROCKWEEDS AND GULFWEEDS (FUCALES) 321 The gametes are produced in a multicellular structure known as a gametangium, and, as in case of a sporangium, the gametan- gium may be formed from a cell within the filament or from a terminal cell on a short lateral branch. The small cubical cells composing a gametangium are packed closely together and each. Fig. 276. — Portions of two fila- ments of Ectocarpus, showing repro- duction. At s are shown spo- rangia, and between the filaments, a zoospore. At g are shown a game- tangium and a single sperm and two s Stock Photo
RMPG4B9M–. Botany for agricultural students . Botany. ROCKWEEDS AND GULFWEEDS (FUCALES) 321 The gametes are produced in a multicellular structure known as a gametangium, and, as in case of a sporangium, the gametan- gium may be formed from a cell within the filament or from a terminal cell on a short lateral branch. The small cubical cells composing a gametangium are packed closely together and each. Fig. 276. — Portions of two fila- ments of Ectocarpus, showing repro- duction. At s are shown spo- rangia, and between the filaments, a zoospore. At g are shown a game- tangium and a single sperm and two s
. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 131. A—F Ectocarpns siUeulosus (Dilhv.) Lyngb. A Zweig mit endständigem, noch nicht geöli'neteiii üanie- 4.„„„: . D rj....: .;i , . , . , -jjg,^ reifen sich entleei'enden Gametangium (330raal vergr.); C die Stock Photo
RMME6JPJ–. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 131. A—F Ectocarpns siUeulosus (Dilhv.) Lyngb. A Zweig mit endständigem, noch nicht geöli'neteiii üanie- 4.„„„: . D rj....: .;i , . , . , -jjg,^ reifen sich entleei'enden Gametangium (330raal vergr.); C die
Archive image from page 202 of Die Natürlichen Pflanzenfamilien nebst ihren. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet dienatrlichenp02engl Year: 1897 Ectocarpaceae. (Kjellman.) 185 Fig. 131. A—F Ectocarpns siUeulosus (Dilhv.) Lyngb. A Zweig mit endständigem, noch nicht geöli'neteiii üanie- 4.„„„: . D rj....: .;i , . . , . , -jjg, reifen sich entleei'enden Gametangium (330raal vergr.); C die Stock Photo
RMT3XYC4–Archive image from page 202 of Die Natürlichen Pflanzenfamilien nebst ihren. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet dienatrlichenp02engl Year: 1897 Ectocarpaceae. (Kjellman.) 185 Fig. 131. A—F Ectocarpns siUeulosus (Dilhv.) Lyngb. A Zweig mit endständigem, noch nicht geöli'neteiii üanie- 4.„„„: . D rj....: .;i , . . , . , -jjg, reifen sich entleei'enden Gametangium (330raal vergr.); C die
Nature and development of plants . OF ULOTHRIX able. When new conditons arise, such as changes of tempera-ture, food, etc., that would interfere with the normal growth ofthe individuals then a modification of the contents of the cellsand its mode of division results. The cells of Ulothrix as a con-sequence of such alterations divide into larger numbers of motilebodies which are consequently smaller than in the case of zoo-spores (Fig. 112, A). These bodies may behave as gametes andunite, forming gametospores. The cells in which gametes areformed are called gametangia, sing, gametangium. Thus, Stock Photo
RM2AXJ6Y8–Nature and development of plants . OF ULOTHRIX able. When new conditons arise, such as changes of tempera-ture, food, etc., that would interfere with the normal growth ofthe individuals then a modification of the contents of the cellsand its mode of division results. The cells of Ulothrix as a con-sequence of such alterations divide into larger numbers of motilebodies which are consequently smaller than in the case of zoo-spores (Fig. 112, A). These bodies may behave as gametes andunite, forming gametospores. The cells in which gametes areformed are called gametangia, sing, gametangium. Thus,
. Fig. 175—177. 177 Trentepohlia Jolithus: a Habitus, b Entwicklungs- reihe des Stielsporangiums. 176 T. annulata: a Entwicklungsgeschichte des Trichtersporangiums, b zwei vegetative Zellen, deren Außenschicht durch Chromscäure zerstört ist. 177 T. calamicola: a Oberer Teil mit Gametangium, b unterer Teil (175a 200 X nach Kützing, b 266 X nach Brand, 176 300 X nach Brand, 177 332 X nach G. S. West). Stock Photo
RMMCP92B–. Fig. 175—177. 177 Trentepohlia Jolithus: a Habitus, b Entwicklungs- reihe des Stielsporangiums. 176 T. annulata: a Entwicklungsgeschichte des Trichtersporangiums, b zwei vegetative Zellen, deren Außenschicht durch Chromscäure zerstört ist. 177 T. calamicola: a Oberer Teil mit Gametangium, b unterer Teil (175a 200 X nach Kützing, b 266 X nach Brand, 176 300 X nach Brand, 177 332 X nach G. S. West).
Archive image from page 127 of Die süsswasser-flora Deutschlands, Österreichs und. Die süsswasser-flora Deutschlands, Österreichs und der Schwez.. diessswasserfl06pasc Year: 1914 113 fc lUa Fig. 172—174. 172 Phycopeltis epiphyton: a Thallus, b Gametangium, c Gametozoosporen. 173 Trentepohlia aurea: a Basaler Teil mit zwei sitzenden Sporangien (Gametangien), b Stielsporangium (Zoosporangium). 174 T. odorata mit Gametangien (172 nach Miliar de t aus Chodat, 173 nach Brand, 174 nach Kützing). Übersicht der Gattungen. Thallus fadenförmig. Trentepohlia (S. 120). Thallus flächenförmig. Phycopeltis Stock Photo
RMT3XN9H–Archive image from page 127 of Die süsswasser-flora Deutschlands, Österreichs und. Die süsswasser-flora Deutschlands, Österreichs und der Schwez.. diessswasserfl06pasc Year: 1914 113 fc lUa Fig. 172—174. 172 Phycopeltis epiphyton: a Thallus, b Gametangium, c Gametozoosporen. 173 Trentepohlia aurea: a Basaler Teil mit zwei sitzenden Sporangien (Gametangien), b Stielsporangium (Zoosporangium). 174 T. odorata mit Gametangien (172 nach Miliar de t aus Chodat, 173 nach Brand, 174 nach Kützing). Übersicht der Gattungen. Thallus fadenförmig. Trentepohlia (S. 120). Thallus flächenförmig. Phycopeltis
. Plants and their uses; an introduction to botany . uppose thatfungi of this sort have descended from such algse;—the multicellularcreeping branches of the thallus becoming multicellular creepinghyphae; the sporangia, dust-spores; the female gametangium de-veloping into a group of asci, while a neighboring cell, simulatingthe male gametangium, gives rise to an enveloping rind. Thesechanges are such as might be expected in passing from the aquaticand sun-using mode of life to the aerial and parasitic. Ascosporeschaiaclerize the Class Ascomycetes. 183. The spore-base fungi (Class Basidiomycetes Stock Photo
RM2CE2RM4–. Plants and their uses; an introduction to botany . uppose thatfungi of this sort have descended from such algse;—the multicellularcreeping branches of the thallus becoming multicellular creepinghyphae; the sporangia, dust-spores; the female gametangium de-veloping into a group of asci, while a neighboring cell, simulatingthe male gametangium, gives rise to an enveloping rind. Thesechanges are such as might be expected in passing from the aquaticand sun-using mode of life to the aerial and parasitic. Ascosporeschaiaclerize the Class Ascomycetes. 183. The spore-base fungi (Class Basidiomycetes
. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Si^. 82. Botrydium granulatum (L.) Grev. A eine Pflanze, welche Schwärmsporen gebildet hat und austreten lässt; B Schwärmspöre; C Individuum, das Gametangien gebildet hat; D Gametangium; E die Gameten im Ausschwärmen begriffen; F, Q verschiedene Copulationsstadien; H, J Zygosporen in verschiedenen Entwiokelungsstadien; Ä'junge Individuen, die durch Keimung der Zygosporen entstanden sind. (Nach Eostafinski u. Woronin Stock Photo
RMME6K4H–. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Si^. 82. Botrydium granulatum (L.) Grev. A eine Pflanze, welche Schwärmsporen gebildet hat und austreten lässt; B Schwärmspöre; C Individuum, das Gametangien gebildet hat; D Gametangium; E die Gameten im Ausschwärmen begriffen; F, Q verschiedene Copulationsstadien; H, J Zygosporen in verschiedenen Entwiokelungsstadien; Ä'junge Individuen, die durch Keimung der Zygosporen entstanden sind. (Nach Eostafinski u. Woronin
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Gamogenesis has been observed in some of the genera by the fusionof isogametes, either similar in all respects to the zoogonidia and producedsingly in a gametangium, or much smaller than the zoogonidia and producedin numbers from a gametangium (Palmetto). CJilorangiese 1S5 In Teiraspora, if the conditions are unfavourable, during the formationof zoogonidia the cells become invested in a strong resistant cell-wall andbecome hypnospores (Gay, 9 Stock Photo
RM2CDFD21–. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Gamogenesis has been observed in some of the genera by the fusionof isogametes, either similar in all respects to the zoogonidia and producedsingly in a gametangium, or much smaller than the zoogonidia and producedin numbers from a gametangium (Palmetto). CJilorangiese 1S5 In Teiraspora, if the conditions are unfavourable, during the formationof zoogonidia the cells become invested in a strong resistant cell-wall andbecome hypnospores (Gay, 9
. 113 fc lUa Fig. 172—174. 172 Phycopeltis epiphyton: a Thallus, b Gametangium, c Gametozoosporen. 173 Trentepohlia aurea: a Basaler Teil mit zwei sitzenden Sporangien (Gametangien), b Stielsporangium (Zoosporangium). 174 T. odorata mit Gametangien (172 nach Miliar de t aus Chodat, 173 nach Brand, 174 nach Kützing). Übersicht der Gattungen. Thallus fadenförmig. Trentepohlia (S. 120). Thallus flächenförmig. Phycopeltis (S. 125). Trentepohlia Martius (=Chroolepus Agardh). Thallus nur aus Fäden bestehend. Kugel-, Stiel- und Trichter- sporangien. Die Kugelsporangien (Gametangien) bringen zahlreich Stock Photo
RMMCP92G–. 113 fc lUa Fig. 172—174. 172 Phycopeltis epiphyton: a Thallus, b Gametangium, c Gametozoosporen. 173 Trentepohlia aurea: a Basaler Teil mit zwei sitzenden Sporangien (Gametangien), b Stielsporangium (Zoosporangium). 174 T. odorata mit Gametangien (172 nach Miliar de t aus Chodat, 173 nach Brand, 174 nach Kützing). Übersicht der Gattungen. Thallus fadenförmig. Trentepohlia (S. 120). Thallus flächenförmig. Phycopeltis (S. 125). Trentepohlia Martius (=Chroolepus Agardh). Thallus nur aus Fäden bestehend. Kugel-, Stiel- und Trichter- sporangien. Die Kugelsporangien (Gametangien) bringen zahlreich
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . each gametangium,including the nucleus and chloroplast, passes into the conjugation-tube. Thegametes, which are thus formed from only part of the protoplast of thegametangium, fuse in the conjugation-tube to form a zygospore. Nuclearfusion does not occur until some time afterwards. The subsequent happeningsare entirely peculiar to the genus Mougeotia. Instead of at once surroundingitself with a new wall this zygospore becomes cut off from the Stock Photo
RM2CDEXD6–. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . each gametangium,including the nucleus and chloroplast, passes into the conjugation-tube. Thegametes, which are thus formed from only part of the protoplast of thegametangium, fuse in the conjugation-tube to form a zygospore. Nuclearfusion does not occur until some time afterwards. The subsequent happeningsare entirely peculiar to the genus Mougeotia. Instead of at once surroundingitself with a new wall this zygospore becomes cut off from the
. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 133. Stnhloncmopsis «VcjYaws Valiante. A Zweig einer von der Pfl. befallenen Cystoseira ericoides (ilmsl^ex^w). B junges Basalfadennetz (330mal vergr.); C Teil eines älteren Basalfadennetzes ; a junger aufrechter faden, &, c, d junge Gametangien, e ein weiter entwickeltes Gametangium (330mal vergr.). (Nach Valiante.) 9. Zosterocarpus Born. Von den übrigen Gattungen durch die Entstehung und den Bau der Gamet Stock Photo
RMME6JPH–. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 133. Stnhloncmopsis «VcjYaws Valiante. A Zweig einer von der Pfl. befallenen Cystoseira ericoides (ilmsl^ex^w). B junges Basalfadennetz (330mal vergr.); C Teil eines älteren Basalfadennetzes ; a junger aufrechter faden, &, c, d junge Gametangien, e ein weiter entwickeltes Gametangium (330mal vergr.). (Nach Valiante.) 9. Zosterocarpus Born. Von den übrigen Gattungen durch die Entstehung und den Bau der Gamet
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . each gametangium,including the nucleus and chloroplast, passes into the conjugation-tube. Thegametes, which are thus formed from only part of the protoplast of thegametangium, fuse in the conjugation-tube to form a zygospore. Nuclearfusion does not occur until some time afterwards. The subsequent happeningsare entirely peculiar to the genus Mougeotia. Instead of at once surroundingitself with a new wall this zygospore becomes cut off from the Stock Photo
RM2CGKXW6–. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . each gametangium,including the nucleus and chloroplast, passes into the conjugation-tube. Thegametes, which are thus formed from only part of the protoplast of thegametangium, fuse in the conjugation-tube to form a zygospore. Nuclearfusion does not occur until some time afterwards. The subsequent happeningsare entirely peculiar to the genus Mougeotia. Instead of at once surroundingitself with a new wall this zygospore becomes cut off from the
. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 105. Acetabularia mediterranea Lamx. A ein Individuum in nat. Gr.; B halbschematisclie Darstellung des Schirmes, n Blattnarben, r rudimentärer Blattquirl unter dem fertilen Schirm, w Ring oberhalb des fertilen Schirmes mit concentrischen Blattnarben; C, D der untere Teil mit Rhizoiden: / der Fuß, 6 die Basalblase (20/1) E Aplanosporen, die später zu einem Gametangium umgebildet werden; F Eutleerung des Gametang Stock Photo
RMME6JYK–. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 105. Acetabularia mediterranea Lamx. A ein Individuum in nat. Gr.; B halbschematisclie Darstellung des Schirmes, n Blattnarben, r rudimentärer Blattquirl unter dem fertilen Schirm, w Ring oberhalb des fertilen Schirmes mit concentrischen Blattnarben; C, D der untere Teil mit Rhizoiden: / der Fuß, 6 die Basalblase (20/1) E Aplanosporen, die später zu einem Gametangium umgebildet werden; F Eutleerung des Gametang
. Plants and their uses; an introduction to botany . Fig. 320.—Thread-weed {Xemalion multifidian. Thread-weed Family,Helminthocladiaccw). I, branch bearing male gamctaugia (sp), and afemale gametangium with swollen base (c) and slender neck (t). II, afemale branch after fertilization, the neck (0 withered, and the basebeginning to divide for the formation of branches. III-V, later stagesin the formation of branches which finally bear spores. All muchmagnified. (Thuret and Bornet.)—A brownish-red seaweed withbranches 5-20 cm. long, on exposed rocks at low-water mark. NorthAtlantic coast. by for Stock Photo
RM2CE2RR0–. Plants and their uses; an introduction to botany . Fig. 320.—Thread-weed {Xemalion multifidian. Thread-weed Family,Helminthocladiaccw). I, branch bearing male gamctaugia (sp), and afemale gametangium with swollen base (c) and slender neck (t). II, afemale branch after fertilization, the neck (0 withered, and the basebeginning to divide for the formation of branches. III-V, later stagesin the formation of branches which finally bear spores. All muchmagnified. (Thuret and Bornet.)—A brownish-red seaweed withbranches 5-20 cm. long, on exposed rocks at low-water mark. NorthAtlantic coast. by for
. Fig. 12. Phyllohium dimorphum: a Gametangium im Gefäßbündel von Lysimachia immniularia, b Gametangium an einem langen Keim- faden, c Gametangium die Sporen entleerend, d Gameten, ^j" und 5, e Keimung (nach Klebs). Mikrogameten verschmelzen. Sie bewegen sich lange Zeit, runden sich dann ab und umgeben sich mit Membran. An der, der geißeltragenden Spitze entsprechenden Stelle bildet sich ein farbloser Keimschlauch, in welchen später das ge- samte Chlorophyll wandert. Die Zygozoosporen dringen in die Spaltöffnungen meist unterseits ein, die Keimschläuche wachsen gegen die Gefäßbündel. Daue Stock Photo
RMMCPA6B–. Fig. 12. Phyllohium dimorphum: a Gametangium im Gefäßbündel von Lysimachia immniularia, b Gametangium an einem langen Keim- faden, c Gametangium die Sporen entleerend, d Gameten, ^j" und 5, e Keimung (nach Klebs). Mikrogameten verschmelzen. Sie bewegen sich lange Zeit, runden sich dann ab und umgeben sich mit Membran. An der, der geißeltragenden Spitze entsprechenden Stelle bildet sich ein farbloser Keimschlauch, in welchen später das ge- samte Chlorophyll wandert. Die Zygozoosporen dringen in die Spaltöffnungen meist unterseits ein, die Keimschläuche wachsen gegen die Gefäßbündel. Daue
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 196. A—C, Gongrosira viridis Kiitz., x500. D—F, G. stagnalis (G. S. West)Schmidle, x 200. zg, zoogonidaugium. Microth amniese 303 Isogametes with two cilia are known to occur in several genera, and thegametangia may be formed from any cell, except in Gongrosira, in whichthey are formed only from the lower cells of the thallus. From 6 to 16gametes arise in a gametangium in Endoderma, but they are much morenumerous in Gongrosira and Leptos Stock Photo
RM2CGPCF8–. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . Fig. 196. A—C, Gongrosira viridis Kiitz., x500. D—F, G. stagnalis (G. S. West)Schmidle, x 200. zg, zoogonidaugium. Microth amniese 303 Isogametes with two cilia are known to occur in several genera, and thegametangia may be formed from any cell, except in Gongrosira, in whichthey are formed only from the lower cells of the thallus. From 6 to 16gametes arise in a gametangium in Endoderma, but they are much morenumerous in Gongrosira and Leptos
. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 06. TrentepohUa nmbrina (Kiitz.) Born. A verzweigte Pfl. mit einem intercalaren, entleerten Gametangium (jf); g' ist ein terminales Garaetangium, das einen zurückgebliebenen Gameten umschließt, v ist eine Blase, die mit den Gameten gebildet wird; B Garaetangium (g), 4 Gameten umscblicßend, welche nicht eopuliert haben, aber mit einer dünnen Membran umgeben sind; C, D Gameten von der Fläche ge- sehen: E Gamet vo Stock Photo
RMME6K8Y–. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet . Fig. 06. TrentepohUa nmbrina (Kiitz.) Born. A verzweigte Pfl. mit einem intercalaren, entleerten Gametangium (jf); g' ist ein terminales Garaetangium, das einen zurückgebliebenen Gameten umschließt, v ist eine Blase, die mit den Gameten gebildet wird; B Garaetangium (g), 4 Gameten umscblicßend, welche nicht eopuliert haben, aber mit einer dünnen Membran umgeben sind; C, D Gameten von der Fläche ge- sehen: E Gamet vo
. Plants and their uses; an introduction to botany . Fig. 327.—Water-mold {Saprolegnia Thureti, Wator-mold Family,SaprolegniacecB). A, dead fly attacked by water-mold, surroundedby radiating hjijha terminating in swarm-spore-cases, {. B, swarni-spore-case in which the spores are forming, ^o. C, same, dischargingswarm-spores. E, female gamatangium containing four female gametesto which comes a projection from the male gametangium that arisesas a branch hypha from below the female gametangium, ^,o. (Thuret,DeBary.)—Water-molds abound upon dead insects, etc., in water. a convex partition, swells Stock Photo
RM2CE2RK6–. Plants and their uses; an introduction to botany . Fig. 327.—Water-mold {Saprolegnia Thureti, Wator-mold Family,SaprolegniacecB). A, dead fly attacked by water-mold, surroundedby radiating hjijha terminating in swarm-spore-cases, {. B, swarni-spore-case in which the spores are forming, ^o. C, same, dischargingswarm-spores. E, female gamatangium containing four female gametesto which comes a projection from the male gametangium that arisesas a branch hypha from below the female gametangium, ^,o. (Thuret,DeBary.)—Water-molds abound upon dead insects, etc., in water. a convex partition, swells
. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . v— Fig. 196. A—C, Gongrosira viridis Kiitz., x500. D—F, G. stagnalis (G. S. West)Schmidle, x 200. zg, zoogonidangium. Microth amnieae 303 Isogametes with two cilia are known to occur in several genera, and thegametangia may be formed from any cell, except in Gongrosirct, in whichthey are formed only from the lower cells of the thallus. From 6 to 16gametes arise in a gametangium in Endoderma, but they are much morenumerous in Gongrosira and Le Stock Photo
RM2CDF0TX–. Algæ. Vol. I. Myxophyceæ, Peridinieæ, Bacillarieæ, Chlorophyceæ, together with a brief summary of the occurrence and distribution of freshwat4er Algæ . v— Fig. 196. A—C, Gongrosira viridis Kiitz., x500. D—F, G. stagnalis (G. S. West)Schmidle, x 200. zg, zoogonidangium. Microth amnieae 303 Isogametes with two cilia are known to occur in several genera, and thegametangia may be formed from any cell, except in Gongrosirct, in whichthey are formed only from the lower cells of the thallus. From 6 to 16gametes arise in a gametangium in Endoderma, but they are much morenumerous in Gongrosira and Le
. Carnegie Institution of Washington publication. 62 FECUNDATION ; MOTILE ISOGAMETES. The process of cell-formation by which the gametes are devel- oped from the protoplast of the gametangium has been observed and described in some detail by Dodel ('76) and by Strasburger ('92). These authors agree that the gametes arise not by the process of free cell-formation, as understood at the time, but by successive bipartitions of the entire plasmic contents of the cell. According to Strasburger ('92) the process of division in the development of the swarm-spores, which is exactly the same for the gam Stock Photo
RMRFWC9R–. Carnegie Institution of Washington publication. 62 FECUNDATION ; MOTILE ISOGAMETES. The process of cell-formation by which the gametes are devel- oped from the protoplast of the gametangium has been observed and described in some detail by Dodel ('76) and by Strasburger ('92). These authors agree that the gametes arise not by the process of free cell-formation, as understood at the time, but by successive bipartitions of the entire plasmic contents of the cell. According to Strasburger ('92) the process of division in the development of the swarm-spores, which is exactly the same for the gam
. Comparative morphology of Fungi. Fungi. LABOULBENIALES 395 which can branch and proceed independently to form asci. By this insertion of a new phase, the activity of the gametangia increases; from a gametangium may arise several gonotoconts. Thus, phylogenetically considered, the reduction caused by the privileging of a small number of gametangial nuclei was overcome. Still the phylogenetic development of the Ascomycetes is most obscure. We need only cite the contradictions between the Pencillium and the Pyronema types, the Taphrina type and the Laboulbenia type. In any case, within the Plec Stock Photo
RMREF6GC–. Comparative morphology of Fungi. Fungi. LABOULBENIALES 395 which can branch and proceed independently to form asci. By this insertion of a new phase, the activity of the gametangia increases; from a gametangium may arise several gonotoconts. Thus, phylogenetically considered, the reduction caused by the privileging of a small number of gametangial nuclei was overcome. Still the phylogenetic development of the Ascomycetes is most obscure. We need only cite the contradictions between the Pencillium and the Pyronema types, the Taphrina type and the Laboulbenia type. In any case, within the Plec
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 197 gamete is found in a similar branch which becomes rather egg- shaped and at maturity opens at the beaked end (Fig. 114, B). A single-celled female gametangium is called an oogonium and the female gamete is frequently referred to as the oosphere or egg. The male gametes are discharged a few minutes after the oogonium opens, when they swarm about the open end of the female gametangium and readily enter it. As soon as fusion has been effected the gametospore becomes invested with a thick wall and in this condition can endure a Stock Photo
RMRDWG87–. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 197 gamete is found in a similar branch which becomes rather egg- shaped and at maturity opens at the beaked end (Fig. 114, B). A single-celled female gametangium is called an oogonium and the female gamete is frequently referred to as the oosphere or egg. The male gametes are discharged a few minutes after the oogonium opens, when they swarm about the open end of the female gametangium and readily enter it. As soon as fusion has been effected the gametospore becomes invested with a thick wall and in this condition can endure a
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 197 gamete is found in a similar branch which becomes rather egg- shaped and at maturity opens at the beaked end (Fig. 114, B). A single-celled female gametangium is called an o5gonium and the female gamete is frequently referred to as the oosphere or egg. The male gametes are discharged a few minutes after the oogonium opens, when they swarm about the open end of the female gametangium and readily enter it. As soon as fusion has been effected the gametospore becomes invested with a thick wall and in this condition can endure a Stock Photo
RMRE1R8E–. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 197 gamete is found in a similar branch which becomes rather egg- shaped and at maturity opens at the beaked end (Fig. 114, B). A single-celled female gametangium is called an o5gonium and the female gamete is frequently referred to as the oosphere or egg. The male gametes are discharged a few minutes after the oogonium opens, when they swarm about the open end of the female gametangium and readily enter it. As soon as fusion has been effected the gametospore becomes invested with a thick wall and in this condition can endure a
. Nature and development of plants. Botany. 276 ARCHEGONIUM OF RICCIOCARPUS antheridium and the canal cells become mucilaginous, thus forming a passageway to the female gamete (Fig. 182, F). The male gametes, attracted, it is supposed, by cane sugar, developed in the archegonium, swim down the canal of the neck, and one unites with the female gamete, as shown in Fig. 182, F, where. Fig. 182. Development of the female gametangium or archegonium A-D, stages in the development of the archegonium from a single cell. E nearly mature archegonium just before the female gamete is formedâen canal cells Stock Photo
RMRE1PWM–. Nature and development of plants. Botany. 276 ARCHEGONIUM OF RICCIOCARPUS antheridium and the canal cells become mucilaginous, thus forming a passageway to the female gamete (Fig. 182, F). The male gametes, attracted, it is supposed, by cane sugar, developed in the archegonium, swim down the canal of the neck, and one unites with the female gamete, as shown in Fig. 182, F, where. Fig. 182. Development of the female gametangium or archegonium A-D, stages in the development of the archegonium from a single cell. E nearly mature archegonium just before the female gamete is formedâen canal cells
. Advances in marine biology: volume 17. Coral fisheries. 206 L. HILLIS-COLINVAUX. Fig. 66. if. incrassata. Section through very dark green gametangium fixed about 12-16 hours before the estimated release time of gametes. Gametes have been differentiated, but separation is not entirely complete (Fig. 67). Gametes containing chloroplast with starch, nucleus and mitochondria are separated from the game- tangial wall shown in the upper right-hand corner by a thick layer of unidentified material, electron-dense bodies and spherical bodies. Several oblique sections of fiagella are included. The wal Stock Photo
RMRR28RN–. Advances in marine biology: volume 17. Coral fisheries. 206 L. HILLIS-COLINVAUX. Fig. 66. if. incrassata. Section through very dark green gametangium fixed about 12-16 hours before the estimated release time of gametes. Gametes have been differentiated, but separation is not entirely complete (Fig. 67). Gametes containing chloroplast with starch, nucleus and mitochondria are separated from the game- tangial wall shown in the upper right-hand corner by a thick layer of unidentified material, electron-dense bodies and spherical bodies. Several oblique sections of fiagella are included. The wal
. Comparative morphology of Fungi. Fungi. Fig. 79.—Pyronema confluens. Development of ascogenous hyphae. Claussen, 1912.) (X 1,165; after hyphae; biologically they offer the advantage that, in contrast to the lower forms, one gametangium can create a number of asci. In most of the higher Ascomycetes, the asci arise on the ascogenous hyphae according to the hook type. In this connection may be men- tioned Pyronema confluens. The ascogenous hyphae springing from the ascogonium are coenocytic, i.e., they contain a number of dicaryons (Fig. 221, 1), and develop by repeated forking, more or less ve Stock Photo
RMREE3D9–. Comparative morphology of Fungi. Fungi. Fig. 79.—Pyronema confluens. Development of ascogenous hyphae. Claussen, 1912.) (X 1,165; after hyphae; biologically they offer the advantage that, in contrast to the lower forms, one gametangium can create a number of asci. In most of the higher Ascomycetes, the asci arise on the ascogenous hyphae according to the hook type. In this connection may be men- tioned Pyronema confluens. The ascogenous hyphae springing from the ascogonium are coenocytic, i.e., they contain a number of dicaryons (Fig. 221, 1), and develop by repeated forking, more or less ve
. Nature and development of plants. Botany. 276 ARCHEGONIUM OF RICCIOCARPUS antheridium and the canal cells become mucilaginous, thus forming a passageway to the female gamete (Fig. 182, F). The male gametes, attracted, it is supposed, by cane sugar, developed in the archegonium, swim down the canal of the neck, and one unites with the female gamete, as shown in Fig. 182, F, where. Fig. 182. Development of the female gametangium or archegonium: A-D, stages in the development of the archegonium from a single cell. E, nearly mature archegonium just before the female gamete is formed—en, canal ce Stock Photo
RMRDWFHT–. Nature and development of plants. Botany. 276 ARCHEGONIUM OF RICCIOCARPUS antheridium and the canal cells become mucilaginous, thus forming a passageway to the female gamete (Fig. 182, F). The male gametes, attracted, it is supposed, by cane sugar, developed in the archegonium, swim down the canal of the neck, and one unites with the female gamete, as shown in Fig. 182, F, where. Fig. 182. Development of the female gametangium or archegonium: A-D, stages in the development of the archegonium from a single cell. E, nearly mature archegonium just before the female gamete is formed—en, canal ce
. The algae. Algae. EUPHYCOPHYTA 99 gametes which develop in gametangia that are cut off from the parent thallus by means of septa. Both types of gamete are bi- flagellate, but the microgametes differ from the macrogametes in that they lack pyrenoids. The gametes are liberated through gela- tinization of the apex of the gametangium, and after fusion has taken place the zygote germinates at once into a new plant. The plants are diploid because meiosis takes place at gamete formation;. Fig- 55 Bryopsis. a, plant of 5. plumosa ( x o-6). b, portion of same ( X 7). c, B. corticulans, rhizoid format Stock Photo
RMRPX83W–. The algae. Algae. EUPHYCOPHYTA 99 gametes which develop in gametangia that are cut off from the parent thallus by means of septa. Both types of gamete are bi- flagellate, but the microgametes differ from the macrogametes in that they lack pyrenoids. The gametes are liberated through gela- tinization of the apex of the gametangium, and after fusion has taken place the zygote germinates at once into a new plant. The plants are diploid because meiosis takes place at gamete formation;. Fig- 55 Bryopsis. a, plant of 5. plumosa ( x o-6). b, portion of same ( X 7). c, B. corticulans, rhizoid format
. Fundamentals of botany. Botany. 252 STRUCTURE AND LIFE HISTORIES OUTLINE OF LIFE HISTORY OF ULOTHRIX Plant Body (Undifferetitiated into gametophyte and sporophyte stages) 1 Physiological Sporangium I Zoospore I Plant body (Undifferentiated into gametophyte and sporo- phyte stages) Physiological Gametangium I I Isogamete Isogamete Conjugation Zygote 4, I Plant body (Undifferentiated into gametophyte and sporo- phyte stages) PLEUROCOCCUS 242. Habitat.—Everyone is familiar with the green layer found on the outer surface of the bark of trees, on. Fig. 183.—Individual plants of green slime (Pleur Stock Photo
RMRE2FP8–. Fundamentals of botany. Botany. 252 STRUCTURE AND LIFE HISTORIES OUTLINE OF LIFE HISTORY OF ULOTHRIX Plant Body (Undifferetitiated into gametophyte and sporophyte stages) 1 Physiological Sporangium I Zoospore I Plant body (Undifferentiated into gametophyte and sporo- phyte stages) Physiological Gametangium I I Isogamete Isogamete Conjugation Zygote 4, I Plant body (Undifferentiated into gametophyte and sporo- phyte stages) PLEUROCOCCUS 242. Habitat.—Everyone is familiar with the green layer found on the outer surface of the bark of trees, on. Fig. 183.—Individual plants of green slime (Pleur
. Plants and their uses; an introduction to botany. Botany; Botany, Economic. THE RED ALGyE 489 of certain l^ranches, and these emit minute, spherical gametes having no flagella or other means of locomotion. At the tips of other branches female gametes appear, each in the form of a flask- shaped cell with long, slender neck (/, /). Fertilization is effected. Fig. 319.—Bladder-wrack; a, vertical section through a couceptacle {^^) .showing the female gametangia; 5, female gametangium beginning to form its eight gametes; c, the same, beginning to set free its gametes: d, male gametangia (shaded) Stock Photo
RMRE0TFR–. Plants and their uses; an introduction to botany. Botany; Botany, Economic. THE RED ALGyE 489 of certain l^ranches, and these emit minute, spherical gametes having no flagella or other means of locomotion. At the tips of other branches female gametes appear, each in the form of a flask- shaped cell with long, slender neck (/, /). Fertilization is effected. Fig. 319.—Bladder-wrack; a, vertical section through a couceptacle {^^) .showing the female gametangia; 5, female gametangium beginning to form its eight gametes; c, the same, beginning to set free its gametes: d, male gametangia (shaded)
. The algae. Algae. 92 THE ALGAE ently not changed very greatly: a large number of fossil forms are known (cf. pp. 297-30). The genera are primarily confined to warm waters and in many there is extensive calcification. Dasycladaceae: Dasydadus (dasy, hairy; cladus, branch). Fig. 51 The family Dasycladaceae is very ancient and was formerly much more widely spread since sixty fossil genera are known whilst there. m P p:^ m Fig. 51 Dasydadus clavaeformis. A, plants. B, assimilatory fila- ments showing mode of branching. C, gametangium {g). D, thickenings at base of assimilatory filaments, h = poi Stock Photo
RMRPX87W–. The algae. Algae. 92 THE ALGAE ently not changed very greatly: a large number of fossil forms are known (cf. pp. 297-30). The genera are primarily confined to warm waters and in many there is extensive calcification. Dasycladaceae: Dasydadus (dasy, hairy; cladus, branch). Fig. 51 The family Dasycladaceae is very ancient and was formerly much more widely spread since sixty fossil genera are known whilst there. m P p:^ m Fig. 51 Dasydadus clavaeformis. A, plants. B, assimilatory fila- ments showing mode of branching. C, gametangium {g). D, thickenings at base of assimilatory filaments, h = poi
. Botany, with agricultural applications. Botany. ROCKWEEDS AND GULFWEEDS (FUCALES) 321 The gametes are produced in a multicellular structure known as a gametangium, and, as in case of a sporangium, the gametan- gium may be formed from a cell within the filament or from a terminal cell on a short lateral branch. The small cubical cells composing a gametangium are packed closely together and each. Fig. 276. — Portions of two fila/- ments of Edocarpus, showing repro- duction. At s are shown spo- rangia, and between the filaments, a aoospore. At g are shown a game- tangium and a single sperm and Stock Photo
RMRDWDD3–. Botany, with agricultural applications. Botany. ROCKWEEDS AND GULFWEEDS (FUCALES) 321 The gametes are produced in a multicellular structure known as a gametangium, and, as in case of a sporangium, the gametan- gium may be formed from a cell within the filament or from a terminal cell on a short lateral branch. The small cubical cells composing a gametangium are packed closely together and each. Fig. 276. — Portions of two fila/- ments of Edocarpus, showing repro- duction. At s are shown spo- rangia, and between the filaments, a aoospore. At g are shown a game- tangium and a single sperm and
. Plants and their uses; an introduction to botany. Botany; Botany, Economic. Fig. 320.âThread-weed (Nemalion miiltifidum. Thread-weed Family, Helminthocladiaccir). I, branch bearing male gametangia {sp), and a female gametangium with swollen base (c) and slender neck (()â II, a female branch after fertilization, the neck (t) withered, and the base beginning to divide for the formation of branches. III-V, later stages in the formation of branches which finally bear spores. All much magnified. (Thuret and Bornet.)âA brownish-red seaweed with branches .5-20 cm. long, on exposed rocks at low-wate Stock Photo
RMRE0TFE–. Plants and their uses; an introduction to botany. Botany; Botany, Economic. Fig. 320.âThread-weed (Nemalion miiltifidum. Thread-weed Family, Helminthocladiaccir). I, branch bearing male gametangia {sp), and a female gametangium with swollen base (c) and slender neck (()â II, a female branch after fertilization, the neck (t) withered, and the base beginning to divide for the formation of branches. III-V, later stages in the formation of branches which finally bear spores. All much magnified. (Thuret and Bornet.)âA brownish-red seaweed with branches .5-20 cm. long, on exposed rocks at low-wate
. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. ZOOSPORES 219 cilia, one directed forwards and the other backwards during movement, and these are attached to one side adjacent to the chloroplast and the prominent eye-spot (Fig, 119, g). The production of zoospores serves as a rapid means of. Fig. 119.—Ectocarpus, a, small part of a thread showing a gametangium (g.), liberating gametes ; b, tip of a branch showing hair-like termi- nations ; c, small part of a thread bearing a zoosporangium (s.) ; d, part of thread showing cell-contents and chloroplasts (ch. Stock Photo
RMRDWPPG–. An introduction to the structure and reproduction of plants. Plant anatomy; Plants. ZOOSPORES 219 cilia, one directed forwards and the other backwards during movement, and these are attached to one side adjacent to the chloroplast and the prominent eye-spot (Fig, 119, g). The production of zoospores serves as a rapid means of. Fig. 119.—Ectocarpus, a, small part of a thread showing a gametangium (g.), liberating gametes ; b, tip of a branch showing hair-like termi- nations ; c, small part of a thread bearing a zoosporangium (s.) ; d, part of thread showing cell-contents and chloroplasts (ch.
. Botany for agricultural students. Plants. ROCKWEEDS AND GULFWEEDS (FUGALES) 321 The gametes arc produced in a iimlticcllular structure known as a gametamjium, and, as in case of a sporangium, the gametan- gium may be formed from a cell within the filament or from a terminal cell on a short lateral branch. The small cubical cells composing a gametangium are packed closely together and each. Fig. 276. — Portions of two fila- ments of Edocarpus, showing repro- duction. At s are shown spo- rangia, and between the filaments, a zoospore. At g are shown a game- tangium and a single sperm and two sp Stock Photo
RMRH8XKK–. Botany for agricultural students. Plants. ROCKWEEDS AND GULFWEEDS (FUGALES) 321 The gametes arc produced in a iimlticcllular structure known as a gametamjium, and, as in case of a sporangium, the gametan- gium may be formed from a cell within the filament or from a terminal cell on a short lateral branch. The small cubical cells composing a gametangium are packed closely together and each. Fig. 276. — Portions of two fila- ments of Edocarpus, showing repro- duction. At s are shown spo- rangia, and between the filaments, a zoospore. At g are shown a game- tangium and a single sperm and two sp
. Advances in marine biology: volume 17. Coral fisheries. ECOLOGY AND TAXONOMY OF Holimeda 205. Fig. 65. H. incrassata. Section through inaniature, green gametangium in early organiza- tional stages of niicrogametes, showing scattered chloroplasts often with starch and oil globules, electron-dense bodies and granules. Fine fibrils on exterior of gametangial wall can be seen in upper left-hand corner. Stamed with lead tartrate. Scale bar is 1 [xm. existence of plants in the fertile condition. In my cultures gametes are usually released about 36 hours after the white gametangial stalks appear, l Stock Photo
RMRR28RX–. Advances in marine biology: volume 17. Coral fisheries. ECOLOGY AND TAXONOMY OF Holimeda 205. Fig. 65. H. incrassata. Section through inaniature, green gametangium in early organiza- tional stages of niicrogametes, showing scattered chloroplasts often with starch and oil globules, electron-dense bodies and granules. Fine fibrils on exterior of gametangial wall can be seen in upper left-hand corner. Stamed with lead tartrate. Scale bar is 1 [xm. existence of plants in the fertile condition. In my cultures gametes are usually released about 36 hours after the white gametangial stalks appear, l
. Botany for agricultural students . Botany. ROCKWEEDS AND GULFWEEDS (FUCALES) 321 The gametes are produced in a multicellular structure known as a gametangium, and, as in case of a sporangium, the gametan- gium may be formed from a cell within the filament or from a terminal cell on a short lateral branch. The small cubical cells composing a gametangium are packed closely together and each. Fig. 276. — Portions of two fila- ments of Ectocarpus, showing repro- duction. At s are shown spo- rangia, and between the filaments, a zoospore. At g are shown a game- tangium and a single sperm and two s Stock Photo
RMRDD830–. Botany for agricultural students . Botany. ROCKWEEDS AND GULFWEEDS (FUCALES) 321 The gametes are produced in a multicellular structure known as a gametangium, and, as in case of a sporangium, the gametan- gium may be formed from a cell within the filament or from a terminal cell on a short lateral branch. The small cubical cells composing a gametangium are packed closely together and each. Fig. 276. — Portions of two fila- ments of Ectocarpus, showing repro- duction. At s are shown spo- rangia, and between the filaments, a zoospore. At g are shown a game- tangium and a single sperm and two s
. Biologisches Zentralblatt. Biology. 54 Hartniann, Die Fortpflanzungsweiseu der Orgauismeu. logie dazu. Üljrigens kann das Weibchen, wie ich häufig beob- achtet habe, noch weiter rückgebildet sein, indem es gar nicht mehr zu einem furchnngsähnlichen Stadium kommt, sondern vom Zwei- zellenstadium an alle weiteren Eier im Innern der der Fortpflan- zung dienenden (axialen) Zelle (Gametangium) entstehen und dann erst heraustreten, so dass also nur eine einzige Furchungszelle zur Eizelle wird (Fig. 7 C9). ^^^ Herauswandern der Eier aus der Fig. 8. B. Please note that these images are extracted fro Stock Photo
RMRHKB8T–. Biologisches Zentralblatt. Biology. 54 Hartniann, Die Fortpflanzungsweiseu der Orgauismeu. logie dazu. Üljrigens kann das Weibchen, wie ich häufig beob- achtet habe, noch weiter rückgebildet sein, indem es gar nicht mehr zu einem furchnngsähnlichen Stadium kommt, sondern vom Zwei- zellenstadium an alle weiteren Eier im Innern der der Fortpflan- zung dienenden (axialen) Zelle (Gametangium) entstehen und dann erst heraustreten, so dass also nur eine einzige Furchungszelle zur Eizelle wird (Fig. 7 C9). ^^^ Herauswandern der Eier aus der Fig. 8. B. Please note that these images are extracted fro
. Biologisches Zentralblatt. Biology. C D. .i » » * - V â *" v«^.1 * «. Richtungskörpcrl) iUluii g und Befruchtung bei den Dicyemiden. A von Dicyema truncata, B, C u. U von Dicyemenna elegans. (Erklärung im Text.) mütterlichen Fortpflanzungszelle (Gametangium) in das Protoplasma der groÃelterlichen Axialzelle ist bei der dauernden Lage der Mutter innerhalb derselben sehr naheliegend, und diesem Umstände ist auch das Unterbleiben des weiteren Wachstums der Weibchen zuzuschreiben (Fig. 7 B 10, 11, 18). Da die infusorienförmigen Emln-yonen (Männchen) sich aus den Keimzellen des Inf Stock Photo
RMRHKB8E–. Biologisches Zentralblatt. Biology. C D. .i » » * - V â *" v«^.1 * «. Richtungskörpcrl) iUluii g und Befruchtung bei den Dicyemiden. A von Dicyema truncata, B, C u. U von Dicyemenna elegans. (Erklärung im Text.) mütterlichen Fortpflanzungszelle (Gametangium) in das Protoplasma der groÃelterlichen Axialzelle ist bei der dauernden Lage der Mutter innerhalb derselben sehr naheliegend, und diesem Umstände ist auch das Unterbleiben des weiteren Wachstums der Weibchen zuzuschreiben (Fig. 7 B 10, 11, 18). Da die infusorienförmigen Emln-yonen (Männchen) sich aus den Keimzellen des Inf
. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet. Botany. Ectocarpaceae. (Kjellman.) 185. Fig. 131. A—F Ectocarpns siUeulosus (Dilhv.) Lyngb. A Zweig mit endständigem, noch nicht geöli'neteiii üanie- 4.„„„: . D rj....: .;i , . , . , -jjg,^ reifen sich entleei'enden Gametangium (330raal vergr.); C die. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illus Stock Photo
RMRCJ96W–. Die Natürlichen Pflanzenfamilien nebst ihren Gattungen und wichtigeren Arten, insbesondere den Nutzpflanzen, unter Mitwirkung zahlreicher hervorragender Fachgelehrten begründet. Botany. Ectocarpaceae. (Kjellman.) 185. Fig. 131. A—F Ectocarpns siUeulosus (Dilhv.) Lyngb. A Zweig mit endständigem, noch nicht geöli'neteiii üanie- 4.„„„: . D rj....: .;i , . , . , -jjg,^ reifen sich entleei'enden Gametangium (330raal vergr.); C die. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illus
. Die süsswasser-flora Deutschlands, Österreichs und der Schwez... Freshwater plants; Aquatic plants. 113 fc lUa Fig. 172—174. 172 Phycopeltis epiphyton: a Thallus, b Gametangium, c Gametozoosporen. 173 Trentepohlia aurea: a Basaler Teil mit zwei sitzenden Sporangien (Gametangien), b Stielsporangium (Zoosporangium). 174 T. odorata mit Gametangien (172 nach Miliar de t aus Chodat, 173 nach Brand, 174 nach Kützing). Übersicht der Gattungen. Thallus fadenförmig. Trentepohlia (S. 120). Thallus flächenförmig. Phycopeltis (S. 125). Trentepohlia Martius (=Chroolepus Agardh). Thallus nur aus Fäden bes Stock Photo
RMRCFWME–. Die süsswasser-flora Deutschlands, Österreichs und der Schwez... Freshwater plants; Aquatic plants. 113 fc lUa Fig. 172—174. 172 Phycopeltis epiphyton: a Thallus, b Gametangium, c Gametozoosporen. 173 Trentepohlia aurea: a Basaler Teil mit zwei sitzenden Sporangien (Gametangien), b Stielsporangium (Zoosporangium). 174 T. odorata mit Gametangien (172 nach Miliar de t aus Chodat, 173 nach Brand, 174 nach Kützing). Übersicht der Gattungen. Thallus fadenförmig. Trentepohlia (S. 120). Thallus flächenförmig. Phycopeltis (S. 125). Trentepohlia Martius (=Chroolepus Agardh). Thallus nur aus Fäden bes
. Die süsswasser-flora Deutschlands, Österreichs und der Schwez... Freshwater plants; Aquatic plants. Ulothrichales. 121 Die heimischen Arten wachsen auf Felsen und an Bäumen. Hier sind sie nur als Epiphyten anzusehen. Ferner kommen sie in Flechten (z. B. Coenogonnori) vor. Manche Arten, die in den. Fig. 175—177. 177 Trentepohlia Jolithus: a Habitus, b Entwicklungs- reihe des Stielsporangiums. 176 T. annulata: a Entwicklungsgeschichte des Trichtersporangiums, b zwei vegetative Zellen, deren Außenschicht durch Chromscäure zerstört ist. 177 T. calamicola: a Oberer Teil mit Gametangium, b unterer Stock Photo
RMRCFWMC–. Die süsswasser-flora Deutschlands, Österreichs und der Schwez... Freshwater plants; Aquatic plants. Ulothrichales. 121 Die heimischen Arten wachsen auf Felsen und an Bäumen. Hier sind sie nur als Epiphyten anzusehen. Ferner kommen sie in Flechten (z. B. Coenogonnori) vor. Manche Arten, die in den. Fig. 175—177. 177 Trentepohlia Jolithus: a Habitus, b Entwicklungs- reihe des Stielsporangiums. 176 T. annulata: a Entwicklungsgeschichte des Trichtersporangiums, b zwei vegetative Zellen, deren Außenschicht durch Chromscäure zerstört ist. 177 T. calamicola: a Oberer Teil mit Gametangium, b unterer
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