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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium thwaitesii
Ralfs

Cosmarium thwaitesii Species: Cell body 58-75 μm long, 26.5-31 μm wide, L/W=2-2.5, isthmus 20-29 μm wide; semicells broad ellipsoidal or ovoidal, apex broad circular or narrowly flattened; cell wall finely dotted; band-form chloroplasts aligned along inner cellwall (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. cucurbita; C. cucurbitinum; C. diplosporum; C. globosum; C. oblongum;

Cosmarium thwaitesii Ralfs ?, cell body 27 μm long, 17 μm wide, L/W=1.6, isthmus 15 μm wide, x 640, Kama-ike (pond), near Suga-daira, Azuma mountain, Fukushima city, Fukushima Pref., Japan, September 3, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium
Cell body 29 μm long, 16 μm wide, L/W=1.8, isthmus 13.5 μm wide, x 640
Cosmarium

Images of collecting locality: Kama-ike (pond), near Sugadaira, Fukushima city, Fukushima Pref., Japan, September 3, 2006 by Y. Tsukii

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