Protist Movie Database

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 1314, colonies of cells, colonies μm in diam., cell body μm long, μm wide, marginal cells 10 μm long (L), notches 5 μm in depth (N), N/L=0.5, Higashi-hiroshima city, Hiroshima Pref. Japan, September, 1998 by Y. Tsukii

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