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Micrasterias is one of the desmids, flattened green algae in which the organism has a central constriction which gives the organism the appearance of being two cells joined together. Differential interference contrast.
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Micrasterias (mike-ras-tear-ee-ass), iconic desmid. The desmids are one type of green algae, often associated with slightly acidic freshwater habitats. As with all desmids, they are formed from two mirror imaged cells. Cellulosic wall, plastid, and pyrenoids are evident. The nucleus is in the centre. Differential interference contrast.
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Micrasterias(mike-raz-tear-ee-ass) is a genus of unicellular algae in the family Desmidiaceae. The cells are flattened and disc-like. The cells of the genus Micrasterias are organized in two semi-cells that are mirror images of each other. The semicells have a distinctive shape with an intricate lobes and indentation. At the end of the lobes the cell wall may sometimes form notches or short spines. The nucleus is located in the centre between the semicells. Each semicell has a chloroplast with some pyrenoids. Usually found in oligotrophic, acid waters. This specimen of Micrasterias pinnatifida collected in the Salzburger Land, Austria. Differential interference contrast.
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Micrasterias radiosa (RALFS,1848). M. sol (EHRENBERG ex KÅ°TZING,1849) is a junior synonym. Phase contrast.
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Micrasterias (mike-ras-tear-ee-ass), iconic desmid. The desmids are one type of green algae, often associated with slightly acidic freshwater habitats. As with most desmids, they are formed from two mirror imaged cells. Cellulosic wall, plastid, and pyrenoids are evident. Differential interference contrast.
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Micrasterias(mike-raz-tear-ee-ass) is a genus of unicellular algae in the family Desmidiaceae. The cells are flattened and disc-like. The cells of the genus Micrasterias are organized in two semi-cells that are mirror images of each other. The semicells have a distinctive shape with an intricate lobes and indentation. At the end of the lobes the cell wall may sometimes form notches or short spines. The nucleus is located in the centre between the semicells. Each semicell has a chloroplast with some pyrenoids. Usually found in oligotrophic, acid waters. This specimen of Micrasterias pinnatifida collected in the Salzburger Land, Austria. Dark ground illumination.
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Docidium undulatum BAIL. The cells are 15-25 times longer than wide with truncated ends. The sides are repeatedly flatly undulated. The central cut is little formed. On both sides around the cut runs a ring with tiny, broadly rounded nipples. Dimension: Length 200 â 250 µm, width 12 â 17 µm Ecology: Acidophilic alga, in acidic fens together with Micrasterias jenneri, Micrasterias truncata und Euastrum armatum. Occurrence: Ubiquitous
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Micrasterias (mike-ras-tear-ee-ass), iconic desmid. The desmids are one type of green algae, often associated with slightly acidic freshwater habitats. As with most desmids, they are formed from two mirror imaged cells. Cellulosic wall, plastid, and pyrenoids are evident. The nucleus is in the centre. Differential interference contrast.
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Micrasterias pinnatifida (KÃTZ.) RALFS The cells are only a little wider than long. The cell halves form three lobes, the lateral lobes are tapered peripherally and have a few denticles at the blunted ends. The lateral lobes are short and are strongly widened with straight ends. The central cut ist deep and strongly widened peripherally. Dimension: Length 60 - 70 µm, width 65 â 75 µm Ecology: Common in moderate acidic to neutral waters of fens and litoral zones. Occurrence: Ubiquitous
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Docidium undulatum BAIL. The cells are 15-25 times longer than wide with truncated ends. The sides are repeatedly flatly undulated. The central cut is little formed. On both sides around the cut runs a ring with tiny, broadly rounded nipples. Dimension: Length 200 â 250 µm, width 12 â 17 µm Ecology: Acidophilic alga, in acidic fens together with Micrasterias jenneri, Micrasterias truncata und Euastrum armatum. Occurrence: Ubiquitous
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Micrasterias (mike-ras-tear-ee-ass), iconic desmid. The desmids are one type of green algae, often associated with slightly acidic freshwater habitats. As with most desmids, they are formed from two mirror imaged cells. Cellulosic wall, plastid, and pyrenoids are evident. The nucleus is in the centre. Phase contrast.
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Micrasterias pinnatifida (KÃTZ.) RALFS The cells are only a little wider than long. The cell halves form three lobes, the lateral lobes are tapered peripherally and have a few denticles at the blunted ends. The lateral lobes are short and are strongly widened with straight ends. The central cut ist deep and strongly widened peripherally. Dimension: Length 60 - 70 µm, width 65 â 75 µm Ecology: Common in moderate acidic to neutral waters of fens and litoral zones. Occurrence: Ubiquitous
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Euastrum crassum (BREB.) KÃTZ. The cells are almost two times longer than wide and rounded rectangular in shape. The lateral lobes are broad and rounded off flat concave. The vertex lobes are short and strongly broadened towards the flat recessed ends. They are separated form the lateral lobes only by shallow cuts. The central cuts arenât broadened towards the periphery. At the base of the cell halves there are three swellings with a big pore at their center. Dimension: Length 150 â 200 µm, width 75 â 90 µm Ecology: Acidophilic alga (pH 4 â 6.5), common in shallow sphagnum ponds. Occurrence: Probably ubiquitous
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Micrasterias is one of the desmids, flattened green algae in which the organism has a central constriction which gives the organism the appearance of being two cells joined together. This detail showing the central nucleus. Differential interference contrast.
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Micrasterias(mike-raz-tear-ee-ass) is a genus of unicellular algae in the family Desmidiaceae. The cells are flattened and disc-like. The cells of the genus Micrasterias are organized in two semi-cells that are mirror images of each other. The semicells have a distinctive shape with an intricate lobes and indentation. At the end of the lobes the cell wall may sometimes form notches or short spines. The nucleus is located in the centre between the semicells. Each semicell has a chloroplast with some pyrenoids. Usually found in oligotrophic, acid waters. This specimen of Micrasterias rotata collected in the Salzburger Land, Austria. Differential interference contrast.
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Euastrum crassum (BREB.) KÃTZ. The cells are almost two times longer than wide and rounded rectangular in shape. The lateral lobes are broad and rounded off flat concave. The vertex lobes are short and strongly broadened towards the flat recessed ends. They are separated form the lateral lobes only by shallow cuts. The central cuts arenât broadened towards the periphery. At the base of the cell halves there are three swellings with a big pore at their center. Dimension: Length 150 â 200 µm, width 75 â 90 µm Ecology: Acidophilic alga (pH 4 â 6.5), common in shallow sphagnum ponds. Occurrence: Probably ubiquitous
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Differential interference contrast.
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Micrasterias(mike-raz-tear-ee-ass) is a genus of unicellular algae in the family Desmidiaceae. The cells are flattened and disc-like. The cells of the genus Micrasterias are organized in two semi-cells that are mirror images of each other. The semicells have a distinctive shape with an intricate lobes and indentation. At the end of the lobes the cell wall may sometimes form notches or short spines. The nucleus is located in the centre between the semicells. Each semicell has a chloroplast with some pyrenoids. Usually found in oligotrophic, acid waters. This specimen of Micrasterias rotata collected in the Salzburger Land, Austria. Dark ground illumination.
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Median optical section through Euastrum crassum using high resolution optics (Planapochromate 40/1.0) and DIC. Sample from sphagnum pond situated in the northern alpine region of Austria near Salzburg. Images were taken using Zeiss Universal with Olympus C7070 CCD camera
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Differential interference contrast.
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Micrasterias rotata (GREV.) RALFS. Length 200 - 300 µm, width 200 - 270 µm. This species is very tolerant concerning living conditions. Therefore the species is widely spread in all altitudes, in forestal ditches and fens of lowlands sometimes abundant.
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The picture shows the cell wall structure with pores. It is developed using 30 high resolution frames combined with manual stacking technique. Sample from sphagnum pond situated in the northern alpine region of Austria near Salzburg. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Staurastrum (star-ass-strum) desmid - a green alga with (as is usual for green algae) a cellulose cell wall which has a star-shaped appearance, and bright green chloroplasts. Differential interference contrast.
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Micrasterias rotata (GREV.) RALFS. Length 200 - 300 µm, width 200 - 270 µm. This species is very tolerant concerning living conditions. Therefore the species is widely spread in all altitudes, in forestal ditches and fens of lowlands sometimes abundant.