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

 Cosmarium tetraophthalmum
Brébisson

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, 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 tetraophthalmum Brébisson: Cell body 90-(106-108)-120 μm long, 60-(64.4-69)-86 μm wide, L/W = 1.5; constriction deep; semicells broad ovoidal or pyramidal in shape, covered with granules (12-14 at each side) but apical ends lack granules (Illustrations of The Japanese Fresh-water Algae, 1977).

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