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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 1844, colony 29 μm in diam., x 640, No.2, Nozomiko (Lake Nozomi), Myoko-kogen (Myoko highland), Iiyama city, Nagano Pref., Japan, April 26, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Pediastrum tetras

Images of collecting locality: No.2, Nozomiko (Lake Nozomi), Madarao highland, Iiyama city, Nagano Pref., Japan, April 26, 2007 by Y. Tsukii

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