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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(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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Cosmarium reniforme (RALFS) ARCHER var. alaskanum CROASDALE The cells and the cell halves are rectangular, the cell ends are weakly rounded off. The central cuts are opened widely along the entire length. The cell wall is covered with numbers of spherical warts, between these small pores. Length 50 µm, width 40 µm. Occurrence: The habitat is apparently limited to northern latitudes.
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Scale bar indicates 10 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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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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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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Cosmarium reniforme (RALFS) ARCHER var. alaskanum CROASDALE The cells and the cell halves are rectangular, the cell ends are weakly rounded off. The central cuts are opened widely along the entire length. The cell wall is covered with numbers of spherical warts, between these small pores. Length 50 µm, width 40 µm. Occurrence: The habitat is apparently limited to northern latitudes.
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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 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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Desmids have the ability to move slowly on the surface excreting mucilage out of special pores. The picture shows this pores of Euastrum oblongum. High resolution DOF picture assembled of over 40 shots (manually stacked) taken with Planapo 63/1.4 showing the multilevel surface structur. 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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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. Differential interference contrast.
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Euastrum oblongum (GREV.) RALFS ex RALFS The cells are appr. 2 times longer than wide and slenderly elliptical in shape. The cell halves consists of two clearly distinguishable sets of lobes which are weakly concave in the center. The vertex lobes are clearly contrasted, widened wedge-shaped with a cut in the center. The cuts in the middle of the cell are not peripherally widened. There exists a big pore in the middle of the cell halves between the two humps. Further humps are visible at the lateral lobes. The cell wall is covered with densely packed pores. Length 150 - 170 µm, width 70 - 85 µm. Occurrence: Adaptable alga, ubiquitous
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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 denticulata collected in the Salzburger Land, Austria. Dark ground illumination.
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Euastrum verrucosum EHRENB. var. groenlandicum (LARSEN) WILLI KRIEG So far only two quite inaccurate illustrations of this alga exist: The original illustration of LARSEN (1904) and an illustration of GROENBLAD (1952). The cell halves are rounded off trapezoidal, both the lateral lobes and the vertex lobe drawn weakly into the center turn into one another, separated only by a shallow emargination. At the ends of the lateral lobes there are several short pricks. The central cuts are far opened. The hump near the isthmus range of the cell halves are covered with large warts, the remaining cell wall with concentric rows of small warts. Length 100 - 105 µm, width 80 - 85 µm. Occurrence: So far only known from Greenland
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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 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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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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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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Differential interference contrast.