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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium reniforme
(Ralfs) W. Archer 1874

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.
Subgenus [ Eucosmarium ]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [ Ornatae ]: Semicells circular, ellipsoid, reniform; cell surface granulated or spiny (Illustrations of The Japanese Fresh-water Algae, 1977).

Species [ var. reniforme ]: Cell body medium in size, slightly longer than width, (47-56)-57 μm long, (32-34.4)-38-40 μm wide, isthmus 15-(17)-20 μm wide; semicells reniform, side view circular, apical view elliptical; cell wall covered with granules (Illustrations of The Japanese Fresh-water Algae, 1977).
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