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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium granatum
Brébisson var. granatum

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 [Pyramidatae]: Cell surface smooth; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).

Species: cell body (22.5-39)-47 μm long, (15.4-24)-30 μm wide, constriction (5.6-8.6)-9 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium granatum Brébisson var. granatum, tape No. 0067, time code 0350, cell body 37 μm long, 24 μm wide, isthmus 8 μm wide, Hiroshima Pref., Japan, September 1998, by Y. Tsukii

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