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Chlorophyceae: Chlorococcales: Hydrodictyaceae

 Pediastrum simplex
Meyen var. simplex (Photomicrographs of the Fresh-water Algae, 1993) ?

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 var. echinulatum, a colony of 8 cells without inner cells, colonies μm in diam., cell body μm long, μm wide, x 640, Heisei-no-mori Park, Kawajima (Kawashima) town, Saitama city, Saitama Pref., Japan, June 2002 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Pediastrum simplex

Pediastrum simplex (Meyen 1829) Lemmermann var. simplex: Colonies of 4, 8, 16, 32 cells with no intercellular space, cells 20-30 μm long, 6-15 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

* Pediastrum simplex var. duodenarium (Bailey) Rabenhorst: Colonies of 4, 8, 16, 32 cells with large intercellular space, cells 15-25 μm long, 6-13 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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