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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 was collected in a moor located in the Salzburger Land, Austria. Differential interference contrast.
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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. Phase contrast micrograph.
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Scale bar indicates 50 µm.Sample from a wetland at the Pillersee (Tyrol, Austria). The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.Image under Creative Commons License V 3.0 (CC BY-NC-SA).
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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 was collected in a moor located in the Salzburger Land, Austria. Dark ground illumination.
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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 americana shows a very special morphological phenomenon. The four minor processes of apical lobes are optional. But if some of them are formed they show rotational symmetry according to direction of the appendices. This depth of focus picture assembling 26 high resolution shots showes a specimen with all four processes formed. See zip archive for details. 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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Micrasterias radiosa (RALFS,1848). M. sol (EHRENBERG ex KÅ°TZING,1849) is a junior synonym. Phase contrast.
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Micrasterias americana shows a very special morphological phenomenon. The four minor processes of apical lobes are optional. But if some of them are formed they show rotational symmetry according to direction of the appendices. This depth of focus picture assembling 14 high resolution shots showes a specimen with one appendix formed. See zip archive for details. Sample from spagnum 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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Micrasterias furcata RALFS The cells are about as long as wide and have a circular shape. The cell halves consist of three lobes. The lateral lobes are clearly separated. At the ends of the lateral lobes there are two outwards standing projections. Between the projections there is a concave area. The central cut is deep and peripherally strongly widened. Dimension: Length 150 - 180 µm, width 150 â 160 µm Ecology: In acidic to moderate acidic fens and bogs. Occurrence: Ubiquitous, rather rare in Central Europe.
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Micrasterias americana (EHR.) RALFS. Length 130 - 150 µm, width 100 - 120 µm. Not rare both in lowlands and in alpine waters, sometimes abundant.
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Micrasterias furcata RALFS The cells are about as long as wide and have a circular shape. The cell halves consist of three lobes. The lateral lobes are clearly separated. At the ends of the lateral lobes there are two outwards standing projections. Between the projections there is a concave area. The central cut is deep and peripherally strongly widened. Dimension: Length 150 - 180 µm, width 150 â 160 µm Ecology: In acidic to moderate acidic fens and bogs. Occurrence: Ubiquitous, rather rare in Central Europe.
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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 apiculata was collected in the Salzburger Land, Austria. Differential interference contrast.
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Micrasterias jenneri RALFS The cells are appr. 1.5 times longer than wide, rounded off rectangular in shape. The cells have five lobes, the lateral lobes are broadened towards the periphery and emaginated in the center, the cuts between them are closed and short. The lateral lobes arenât spread apart, they are strongly widened peripherally and rounded with shallow emarginations in the center. The central cut is deep, closed, and not peripherally widened. Dimension: Length 150 - 180 µm, width 100 â 130 µm Ecology: Acidophilic alga, lives in sphagnum ponds together with other algae which prefer upland moor waters. Occurrence: Probably ubiquitous, mainly in colder zones.
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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 apiculata was collected in the Salzburger Land, Austria. Dark ground illumination.
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Micrasterias jenneri RALFS The cells are appr. 1.5 times longer than wide, rounded off rectangular in shape. The cells have five lobes, the lateral lobes are broadened towards the periphery and emaginated in the center, the cuts between them are closed and short. The lateral lobes arenât spread apart, they are strongly widened peripherally and rounded with shallow emarginations in the center. The central cut is deep, closed, and not peripherally widened. Dimension: Length 150 - 180 µm, width 100 â 130 µm Ecology: Acidophilic alga, lives in sphagnum ponds together with other algae which prefer upland moor waters. Occurrence: Probably ubiquitous, mainly in colder zones.
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The picture shows the outline and the texture of the cell wall with the numerous spines on the cell wall and was built up using 38 high resolution DIC frames with manual stacking technique using Corel Photopaint. The scale bar indicates 100 µm. 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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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 denticulata collected in the Salzburger Land, Austria. 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 denticulata collected in the Salzburger Land, Austria. Dark ground illumination.
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Micrasterias denticulata.
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This optical median section of the desmid cell shows the outline, the texture of the chloroplast with many pyrenoids and the nucleus at the center of the cell. This multi layer image was built up using 20 high resolution DIC frames with manual stacking technique using Corel Photopaint. The scale bar indicates 50 µm. 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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The entire cell wall of the surface is in focus by combining 30 frames with manual stacking technique. Scale bar indicates 50 µm. 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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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 fimbriata was collected in the Salzburger Land, Austria. 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 fimbriata was collected in the Salzburger Land, Austria. Dark ground illumination.
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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 fimbriata collected in the Salzburger Land (Austria), photographed in dark field.