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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium sportella
Brébisson var. subnudum W. et G.S. West

Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. subnudum): Cell body (42)-51 μm long, (33.6)-41 μm wide, isthmus 11-(14.5) μm wide, apex slightly depressed; (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium sportella Brébisson var. subnudum, tape No. 0067, time code 0350, cell body about 48 μm long, 38 μm wide, constriction μm wide, Hiroshima Pref., Japan, October 1998, by Y. Tsukii

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