Gamophyceae: Zygnematales: Desmidiaceae
(Charophyceae: Zygnematales: Desmidiaceae)

 Cosmarium botrytis
Wittrock

Cosmarium 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).

Cosmarium botrytis var. subtumidum, x 400, x 640, Aug. 7-13 1999, Vermont-Maine U.S.A., by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640

Cosmarium botrytis var. subtumidum Wittrock: Cell body 52-(56)-80 μm long, 43-(51)-65 μm wide, constriction 10-(14)-15 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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