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:

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Cell surface smooth
Pediastrum sp. colony 86 μm φ Imori pond Myoko highland Niigata, 2004	Pediastum sp. or P. boryanum ? Stock 37-2D Uruguay, 1999	Pediastrum sp. or P. boryanum ? Stock 37-2D Uruguay, 1999	Pediastrum sp. colony disintegrated Stock 37-2D Uruguay, 1999
Pediastrum sp. 70 x 55 μm Ichinose-enchi Norikura highland Nagano, 2005
Cell surface wrinkled; intercellular space present
Pediastrum sp. or P. angulosum ? 220 x 110 μm Tane-ike Togakushi highland Nagano, 2005	Pediastrum sp. or P. angulosum ? stock Ntta-1 Tane-ike Togakushi highland Nagano, 2005	Pediastrum sp. or P. angulosum ? Umi-no-nakamichi Fukuoka, 2001	Pediastrum sp. stock Fum-2 Umi-no-nakamichi Fukuoka, 2001
Pediastrum sp. stock Fum-2 Umi-no-nakamichi Fukuoka, 2001	Pediastrum sp. 125 μm near Omine Minakami Gunma, 2006	Pediastrum sp. 65, 75 μm Hasu-ike Shiga highland Nagano, 2005	Pediastrum sp. 56 μm φ near Yamaguchi Univ. Yamaguchi, 2004
Pediastrum sp. 125 x 140 μm near Yamaguchi Univ. Yamaguchi, 2004	Pediastrum sp. USA, 1999

Similar species -->> P. boryanum; P. angulosum;

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