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Pleurotaenium, one of many desmids - most of which have the appearance of mirror imaged cells joined together, but typically with only one nucleus. With cellulose cell wall, bright green chloroplasts. Phase contrast micrograph.
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Micrasterias denticulata.
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Non-filamentous desmid. The depht of focus picture shows a cell with stelloid chloroplasts and abundance of lipid drops. Zip archive includes also the topmost picture of the DOF stack. Picture generated from 11 shots using CombineZ by Alan Hadley, MicroPicS by Bernhard Wiedemann and Photoshop. For details see ZIP archive. Sample from sphagnum pond Dosenmoor near Neumuenster (Schleswig-Holstein, Germany). Images were taken using Zeiss Universal with Olympus C7070 CCD camera.
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Pleurotaenium, one of many desmids - most of which have the appearance of mirror imaged cells joined together, but typically with only one nucleus. This is a detail of the ribbon like plastids with nuerous refractile pyrenoids. Differential interference contrast.
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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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Xanthidium antilopaeum (BREB.) KÃTZ. var. crameri GRÃNBLAD The cells are a little wider than long and octagonal in coarse shape. The central cut is deep and extends strongly outwards. The cell halves are oblong hexagonal with straight or weakly concave sides, the vertices are broadly truncated. At each lateral and apical angle a pair of long pricks originate. Above the center is a flat, often slightly brown colored swelling of the cell wall occupies with small warts. Length without pricks 50 - 60 µm, width without pricks 58 - 63 µm. Occurrence: In littoral zones of mountain lakes in Central Europe rather rarely.
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Pleurotaenium, one of many desmids - most of which have the appearance of mirror imaged cells joined together, but typically with only one nucleus. With cellulose cell wall, bright green chloroplasts. This is an elongate species. Differential interference contrast.
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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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Xanthidium antilopaeum (BREB.) KÃTZ. var. crameri GRÃNBLAD The cells are a little wider than long and octagonal in coarse shape. The central cut is deep and extends strongly outwards. The cell halves are oblong hexagonal with straight or weakly concave sides, the vertices are broadly truncated. At each lateral and apical angle a pair of long pricks originate. Above the center is a flat, often slightly brown colored swelling of the cell wall occupies with small warts. Length without pricks 50 - 60 µm, width without pricks 58 - 63 µm. Occurrence: In littoral zones of mountain lakes in Central Europe rather rarely.
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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 fimbriata was collected in the Salzburger Land, Austria. Differential interference contrast.
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Non-filamentous desmid. The depht of focus picture shows a cell with stelloid chloroplasts. Multi layer image (DOF) using about 65 frames generating depth of focus, stacked manually using Corel Photopaint. Sample from sphagnum pond Dosenmoor near Neumuenster (Schleswig-Holstein, Germany). This image was taken using Zeiss Universal with Olympus C7070 CCD camera.
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Collected from Cumloden Swamp on October 7, 2002.
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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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Xanthidium cristatum BREB. In RALFS The cells are little longer than wide, octagonal in coarse shape with straight or weakly concave sides. The central cut is strongly extended outwards. On each side of each cell half origins one prick . The lateral and apical angles likewise have one pair of pricks each. In the center of the cell halves is flat, hemispheric swelling. Length without pricks 50 - 55 µm, width without pricks 40 - 43 µm. Occurrence: In Central Europe sporadic in moderate acidic waters of fens, siltation zones et cetera.
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Non-filamentous desmids have the ability to move slowly by means of directed jelly secretion. Secration can take place at the nobs you see on the cell surface. Depht of focus approach can show cell surface together with folded chloroplasts and cell contour. Scale bar indiicates 25 µm. In ZIP archive there are more DOF pictures. Picture generated from 5 shots using CombineZ by Alan Hadley. Sample from spagnum pond Dosenmoor near Neumuenster (Schleswig- Holstein, Germany). 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 collected in the Salzburger Land (Austria), photographed in dark field.
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Xanthidium cristatum BREB. In RALFS The cells are little longer than wide, octagonal in coarse shape with straight or weakly concave sides. The central cut is strongly extended outwards. On each side of each cell half origins one prick . The lateral and apical angles likewise have one pair of pricks each. In the center of the cell halves is flat, hemispheric swelling. Length without pricks 50 - 55 µm, width without pricks 40 - 43 µm. Occurrence: In Central Europe sporadic in moderate acidic waters of fens, siltation zones et cetera.
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Empty cell wall from Tetmemorus spec. Pores are clearly visible. Sample from sphagnum pond Dosenmoor near Neumuenster (Schleswig-Holstein, Germany). 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 papillifera collected 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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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 papillifera collected in the Salzburger Land, Austria. Dark ground illumination.