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Chlorophyta: Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum duplex
(Turpin) Meneghini

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 or X-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, tape No. 0128, time code 0246, Higashi-hiroshima city, Hiroshima Pref. Japan, September, 1998 by Y. Tsukii

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