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Chlorophyceae: Chlorococcales: Hydrodictyaceae

 Pediastrum sp.
Meyen

Pediastrum 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:

Pediastrum sp. (P. angulosum ?), stock Ntta-1, axenic culture (from January 10 to February 8, 2006), young colonies 73 μm in diam. (left), 110 μm long, 70 μm wide, L/W=1.6 (center), 110 μm long, 72 μm wide, L/W=1.5 (right), cell wall wrinkled, x 400, x 640, Tane-ike (pond), Togakushi highland, Shinano town, Nagano Pref., Japan, June 12, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Pediastrum Pediastrum Pediastrum
Colony 184 μm long, 130 μm wide, L/W=1.4, x 400, x 640
Pediastrum Pediastrum Pediastrum
Matured colony 200 μm long, 145 μm wide, L/W=1.4, x 400, x 640
Pediastrum Pediastrum Pediastrum
Matured colony 240 μm long, 165 μm wide, L/W=1.5, x 400, x 640
Pediastrum Pediastrum
Colony after releasing daughter colonies, cell wall wrinkled
Pediastrum Pediastrum

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