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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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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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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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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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Micrasterias rotata (GREV.) RALFS Length: 200 â 300 µm, width: 200 â 270 µm. This specie is very tolerant concerning living conditions. Therefore the species is widely spread in all altitudes, in forestal ditches and lowland fens sometimes abundant. The cells are 1.08 to 1.15 times longer than wide, the shape seems almost circular or wide elliptical. The cell is devided into lobes due to deep cuts, the terminations of lobes are denticulated. The central lobe is broadened evenly at the end. The termination is formed concavely and is lightly arched upwards at both sides. The lateral angles of the central lobe are little denticulated. The cut in the middle of the cell (sinus) is very deep and peripherally a little widened. The cellwall is densly punctuated by tiny pores. The Chromatophores have several scattered pyrenoids with varying sizes.
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The picture shows the outline, the texture of the cell wall and some dictyosomes producing mucilage for motion (see also inserted image). This multi layer image was built up using 40 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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This optical medial 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 9 high resolution DIC frames with manual stacking technique using Corel Photopaint. 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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A very special view of Micrasterias rotata using an inverted microscope. The cell ist standing perpenticular upon its apical lobe. Like all the desmids Micrasterias can move using mucilage for backstroke. They move towards the light. When it's dark they erect with help of mucilage ejection. 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 IM35 with Olympus C7070 CCD camera.
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