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Chlorophyta: Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum tetras
(Ehrenberg) Ralfs, 1844

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, tape No. 0128, time code 0703, Higashi-hiroshima city, Hiroshima Pref. Japan, September, 1998 by Y. Tsukii

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