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Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum simplex
Meyen var. duodenarium (Bailey) Rabenhorst (Illustrations of The Japanese Fresh-water Algae, 1977) ?

Pediastrum simplex 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: Marginal cells with a single, long horn-like process (Photomicrographs of the Freshwater Algae, vol. 8, 1988).
Var. simplex: Colonies with large perforations; marginal cells Y- to T-shaped, triangular to trapezoid at maturity, 12-52 μm long, 6-30 μm wide; inner cells Y-shaped, 7-35 μm long, 7-28 μm wide; cell wall granulated or smooth (Photomicrographs of the Freshwater Algae, vol. 11, 1993).
Var. duodenarium: Colonies of 4, 8, 16, 32 cells, large intercellular space present, cells 15-25 μm long, 6-13 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).


Pediastrum simplex Meyen var. duodenarium (Bailey) Rabenhorst (or Pediastrum biwae Negoro ?), colony nearly circular, 107 μm in diam. (including horn-like processes), x 640, Saiko (Lake Sai), Teigai, Toda city, Saitama Pref., Japan, August 8, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Pediastrum simplex Pediastrum simplex


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