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Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum tetras
(Ehrenberg) Ralfs var. tetras, 1844

Pediastrum tetras Genus: Colonies of a fixed number of cells, flat, circular in shape; cell body polygonal in shape, with horn-like projections; cell wall garanulated, wrinkled or notched; chloroplasts plate-like or reticular; asexual reproduction by zoospore; sexual reproduction by isogametes (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Colonies without perforations, 12-74 μm in diam.; all cells with a deep incision, cell wall smooth ; marginal cells with two triangular processes extending outward, triangular (colonies with small number of cells) or trapezoid (large colonies) at base, 5-18 μm in diam., 4-18 μm long; inner cells five to seven angled, 4-16 μm in diam., 4-14 μm long (Photomicrographs of the Freshwater Algae, vol. 5, 1986).

Pediastrum tetras (Ehrenberg) Ralfs var. tetras (or var. tetraodon (Corda) Rabenhorst ?), colonies of cells, colonies μm in diam., cell body μm long, μm wide, marginal cells 11 μm long (L), notches 5 μm in depth (N), N/L=0.45, x 400, x 640, Uruguay, 1999, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640

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