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Ribadelago, Castille and Leon, Spain
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Canencia, Madrid, Spain
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Canencia, Madrid, Spain
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Ajamil, La Rioja, Spain
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Canencia, Madrid, Spain
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Ribadelago, Castille and Leon, Spain
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Mahide, Castille and Leon, Spain
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Canencia, Madrid, Spain
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Ajamil, La Rioja, Espaa
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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(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 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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Covaleda, Castille and Leon, 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 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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Canencia, Madrid, Spain
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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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Canencia, Madrid, Spain
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Canencia, Comunidad de Madrid, Espaa
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