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Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum boryanum
(Turpin) Meneghini var. boryanum

Pediastrum boryanum 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 (sometimes 64, 128) cells, spherical or ellipsoid in shape, intercellular space absent; inner cells tetragonal to hexagonal, concaved at outer side; marginal cells with two long horn-like processes; a tuft of bristles projected from apex of the processes; zoospores produced within the mother cells; daughter colonies formed in a vesicle released from the mother cells; cell wall granulated (Photomicrographs of the fresh-water algae, 1993).


Pediastrum boryanum var. boryanum, stock Ton-2, axenic culture with Hyponex and KCM, colonies of cells, colonies μm in diam., cell body μm long, μm wide, x 400, x 640, Nogi shrine, Nishinasuno-machi, Tochigi Pref., Japan, 2001, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Pediastrum boryanum Pediastrum boryanum Pediastrum boryanum
Formation of daughter colonies, x 400, x 640
Pediastrum boryanum Pediastrum boryanum Pediastrum boryanum
x 400, x 640, x 400, x 640
Pediastrum boryanum Pediastrum boryanum Pediastrum boryanum Pediastrum boryanum
x 640
Pediastrum boryanum Pediastrum boryanum Pediastrum boryanum

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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