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Chlorophyceae: Chlorococcales: Hydrodictyaceae

 Pediastrum muticum
Kützing var. longicorne Raciborski
( or P. boryanum (Turpin) Meneghini var. longicorne Reinsch )

Pediastrum muticum 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 muticum, Tnk-2 (formerly Tkk-2), axenic culture with Hyponex & KCM, colonies of cells, colonies μm in diam., cell body μm long, μm wide, x 640, Karasugamori, Nishinasuno town, Tochigi Pref., Japan, 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Pediastrum Pediastrum Pediastrum Pediastrum
Pediastrum Pediastrum
Formation of daughter colonies
Pediastrum Pediastrum Pediastrum
Pediastrum Pediastrum Pediastrum Pediastrum
Pediastrum Pediastrum Pediastrum Pediastrum
Pediastrum Pediastrum Pediastrum Pediastrum
Abnormal colonies
Pediastrum Pediastrum Pediastrum

Pediastrum boryanum (Turpin) Meneghini, 1840: Colonies of 8, 16, 32 cells; no space between adjacent cells; a pair of horn-like projections; cell wall covered with fine granules; cell body 13-18 μm diam. (Illustrations of The Japanese Fresh-water Algae, 1977).

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