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Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum duplex
Meyen var. duplex

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: Colonies of 8-32 (rarely 4, 64 or 128 cells) with large intercellular space; inner cells H-shaped, trapezoid to rectangular when matured; outer half of the marginal cells prolonged into two horn-like processes with a tuft of long bristles; daughter colonies formed in a vesicle released from mother cell; cell wall smooth (Photomicrographs of the fresh-water algae, 1994).

Pediastrum duplex var. duplex, 16-, 8-cells type, 16 = 10+5+1; 8 = 7+1, colonies of cells, colonies μm in diam., cell body μm long, μm wide, x 400, Japan, 199? by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Pediastrum Pediastrum Pediastrum

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