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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium quinarium
P. Lundell

Cosmarium quinarium 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).
Species: Cell body 39-(42-43) μm long, 33-24 μm wide, constriction 9.5-(11-12.7) μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium quinarium P. Lundell, cell body 39 μm long, 38 μm wide, isthmus 12 μm wide, 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 sp., cell body 40 μm long, 40 μm wide, constriction 12 μm wide, x 400, x 640, August 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 Cosmarium Cosmarium

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