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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 var. formosulum, cell body 39 μm long, 37 μm wide, L/W=1.1, isthmus 14 μm wide, x 640, Yacho-no-ike (pond), Minuma Natural Park, Midori-ku, Saitama city, Saitama Pref., Japan, April 29, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium formosulum Cosmarium formosulum Cosmarium formosulum
Cell body 40 μm long, 35 μm wide, L/W=1.1, isthmus 12 μm wide, x 640
Cosmarium formosulum Cosmarium formosulum

Images of collecting locality: Yacho-no-ike (pond), Minuma Natural Park, Midori-ku, Saitama city, Saitama Pref., Japan, April 29, 2007 by Y. Tsukii

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