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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium globosum
Bulnheim var. globosum
= Actinotaenium globosum (Bulnheim) Teiling ?

Cosmarium globosum Species [ var. globosum ]: Cell body small in size, slightly constricted at the center, 30-39 μm long, 20-28 μ wide, L/W=1.5, isthmus 19-26 μm wide; outline of semicells 2/3 of circle, apex rounded; cell wall dotted.
[ var. wollei ]: Constriction stronger than that of var. globosum, 38.5-(42-43) μm long, 24-(33-39) μm wide, L/W < 1.5, isthmus 21-(31-37) μm wide, cell wall covered with small pores.
[ var. subaltum ]: Longer than var. globosum, 31 μm long, 20 μm wide, isthmus 17 μm wide; cellwall dotted.
[ var. minus ]: Smaller than var. globosum, 17-(21-22.5) μm long, 13-(15.4)-18 μm wide, isthmus 9.5-(9.8)-15 μm wide.
[ f. minor ]: 16.8-27.4 μm long, 10.6-16.7 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -- >> C. thwaitesii;


Cosmarium globosum Bulnheim globosum, cell body 34 μm long, 21.5 μm wide, L/W=1.6, isthmus 19 μm wide, x 640, No. 9-1, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium

Images of collecting locality: No. 9, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii


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