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Tetraspora (tet-ra-spore-a), a volvocalean green alga in which the cells are located within a mucus matrix. Like Chlamydomonas, there are two apical flagella inserting into an ovate cell, anterior contractile vacuoles, and there is a single large cup-shaped chloroplast. Phase contrast.
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Asterococcus (a-stir-owe-cock-us) superbus. The large round or ellipsoid cells of Asterococcus occur singly or in groups with up to 8 cells embedded in a well-developed mucilage envelope. Groups reach 180 microns in diameter. The gelatinous sheaths are normally colourless and in concentrically arranged layers. The sheaths may be coloured brown by iron hydroxide. The single chloroplast is star-shaped and the pyrenoids are arranged in the center of the cell. The nucleus is located in a gap between the strands of the chlororoplast, together with two contractile vacuoles. No eyespot. Common in freshwater ponds and lakes. This image is of a squashed colony of Asterococcus superbus. The concentrically arranged layers of the gelatinous sheaths are clearly visible. The cells measuring 22 - 26 microns in diameter. Differential interference contrast.
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Scale bar indicates 25 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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Villoslada de Cameros, La Rioja, Spain
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Ribadelago de Franco, Castille and Leon, Spain
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Scale bar indicates 25 m.Sample from the pond Hegne Moor situated in the vicinity of Lake Constance. The image was built up using several photomicrographic frames with manual stacking technique. Images were taken using Zeiss Universal with Olympus C7070 CCD camera.For permission to use of (high-resolution) images please contact postmaster@protisten.de.
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Los Cotos, Comunidad de Madrid, Espaa
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Ribadelago de Franco, Castille and Leon, Spain
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Villoslada de Cameros, La Rioja, Spain
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Lumbreras, La Rioja, Spain
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Los Cotos, Madrid, Spain
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