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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium notabile
Brébisson

Cosmarium notabile 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:

Cosmarium notabile or or C. formosulum ?, cell body 21 μm long, 16 μm wide, constriction 7 μm wide, x 400, Tochigi Pref., Japan, 1997, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400
Cosmarium Cosmarium

Cosmarium sp. (notabile ?), x 200, Tochigi Pref., Japan, 1997, by Y. Tsukii
Cosmarium

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