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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium tetraophthalmum
Brébisson

Cosmarium tetraophthalmum 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.
Section [Margaritiferae]: Cell surface granulated, gnarled or spiny; semicells pyramidal with flattened apex, scalariform (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Similar species -->> C. heterodentatum;

Cosmarium tetraophthalmum Brébisson (or C. granulatum W. et G.S. West ?), cell body 88 μm long, 64 μm wide, isthmus μm wide, L/W=1.4, x 400, x 640, Vermont-Maine U.S.A., August 7-13, 1999, 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 Cosmarium Cosmarium Cosmarium
Cosmarium Cosmarium Cosmarium Cosmarium Cosmarium
Cosmarium Cosmarium Cosmarium

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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