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Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum duplex
Meyen var. rotundatum Lucks

Pediastrum duplex 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 [ var. rotundatum ]: Colonies of 16, 32 cells, with large inter-cellular space; marginal cells with two long processes club-shaped to long-ellipsoid, apex truncated; inner cells H-shaped with roundly concaved sides; cell wall smooth (Photomicrographs of the Freshwater Algae, vol. 18, 1997).


Pediastrum sp., a colony of 15 cells, colonies of cells, colonies μm in diam., cell body μm long, μm wide, x400, x 640, Japan, 1998 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Pediastrum Pediastrum


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