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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium formosulum
Hoffmann var. formosulum

Cosmarium Species [ var. formosulum ]: Cell body small, trapezoid in shape, basal margins broadly rounded, both sides crenated with 6-7 projections, apex slightly wavy (5 waves), (34)-40-50 μm long, (34)-40 μm wide, isthmus 10-(11)15.5 μm wide; cell wall granulated; semicells with about 5 longitudinal ridges at the center, granules present on each ridge, side view ovoid (Illustrations of The Japanese Fresh-water Algae, 1977).
[var. mesochondrium]: Cell body 37.8-39 μm long, 30-31 μm wide, isthmus 9.8-11 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium formosulum Hoffmann var. formosulum, cell body 35 μm long, 26 μm wide, L/W=1.3, x 640, rice field, Shimo-muneoka, Shiki city, Saitama Pref., Japan, October 24, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium formosulum Cosmarium formosulum

* Cosmarium formosulum Hoffmann var. formosulum: Cell body (34)-40-50 μm long, (34)-40 μm wide, isthmus 10-(11)15.5 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium formosulum var. mesochondrium (Schmidle) Hirano: Cell body 37.8-39 μm long, 30-31 μm wide, isthmus 9.8-11 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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