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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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S Pedro, Galicia, Spain
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Lumbreras, La Rioja, Spain
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Los Cotos, Madrid, Spain
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Ribadelago de Franco, Castilla y Len, Espaa
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Guitiriz, Galicia, Spain
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Ribadelago, Castille and Leon, Spain
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Lumbreras, La Rioja, Spain
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Los Cotos, Madrid, Spain
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Lumbreras, La Rioja, Spain
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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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S Pedro, Galicia, Spain
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A Veiga, Galicia, Spain
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Galende, Castille and Leon, Spain
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Ribadelago de Franco, Castilla y Len, Espaa
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Canencia, Madrid, Spain
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Villoslada de Cameros, La Rioja, Espaa
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Villoslada de Cameros, La Rioja, Spain
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Lumbreras, La Rioja, Spain
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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.