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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium subspeciosum
Nordstedt var. subspeciosum

Cosmarium subspeciosum 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 [ var. subspeciosum ]: Variety: Cell body 41-50 μm long, 29-36 μm wide; isthmus 11-16 μm wide.
[ var. validius ]: Cell body 68-84 μm long, 47-53-(56) μm wide; isthmus 17.5-22 μm wide (Illustrations of the Japanese Fresh-Water Algae, 1977).

Cosmarium subspeciosum Nordstedt var. subspeciosum, cell body 35 μm long, 28 μm wide, L/W=1.3, isthmus 11 μm wide, x 640, a small wetland near Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium subspeciosum Cosmarium subspeciosum

Cosmarium subspeciosum zygote ?, cell body 32 μm in diam., projections about 8 μm long, x 640, Numa-no-hara marsh (Genseikaen), Madarao highland (Niigata & Nagano Pref.), Myoko village, Niigata Pref., Japan, May 15, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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