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, 16, 32, 64 cells with large intercellular spaces; mariginal cells with two narrow, long, horn-like processes, of which apex truncated; inner cells H or X-shaped with deeply concaved sides; cell wall smooth (Photomicrographs of the fresh-water algae, 1997). |
50 μm
100 μm
150 μm; x 400
Pediastrum duplex var. gracilimum W. et G. S. West,
colonies μm in diam., cell body μm long, μm wide,
x 400, x 640, Mizumoto Park, Katsushika-ku, Tokyo, Japan, July 2001 by Y. Tsukii
50 μm
100 μm
150 μm; x 400
