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Chlorophyceae: Chlorococcales: Hydrodictyaceae

Pediastrum angulosum
(Ehrenberg) Meneghini var. angulosum
Syn.: P. araneosum (Raciborski) G.M. Smith var. rugulosum (G.M. West) G.M. Smith

Pediastrum angulosum 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, without perforations; basal parts of the marginal cells polygonal, usually 4- to 5-sides; outer sides concave, incision V- or U-shaped, with two conical processes; cell wall with irregularly reticulate ridge (Photomicrographs of the Freshwater Algae, vol. 18, 1997).
Simiar species -->> P. duplex var. rugulosum (with perforations);

Pediastrum angulosum (Ehrenberg) Meneghini var. angulosum (Syn.: Pediastrum araneosum (Raciborski) G.M. Smith var. rugulosum), colony of cells, disc-shaped, μm in diam., cell body μm long, μm wide, L/W=, x 640, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, September 10, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Pediastrum Pediastrum

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