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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, 8-cells type, 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, Mashiko City, Tochigi-Pref., Japan, 1999, collected by H. Shiomizu, photo 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
Pediastrum Pediastrum


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