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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium pseudoprotuberans
Kirchner f. minor Schmidle

Cosmarium pseudoprotuberans 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.
Subgenus [ Eucosmarium ]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [ Globuliferae ]: Cell surface smooth; semicells circular, ellipsoidal, reniform (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium pseudoprotuberans Kirchner (f. minor Schmidle ?), cell body 21 μm long, 15 μm wide, isthmus 3.5 μm wide, x 640, Shimo-no-koike (small pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, September 26, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640

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