Gamophyceae:
Zygnematales: Desmidiaceae
Cosmarium subspeciosum
Nordstedt var. 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).
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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
31 μm
63 μm
94 μm; x 640
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
31 μm
63 μm
94 μm; x 640
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