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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 μm long, μm wide, L/W=, isthmus μm wide, x 640, No.4, Yahei-daira-shitsugen (Yahei-daira marsh), North of Higashidaiten, Azuma mountains, Yonezawa city, Yamagata Pref., Japan, July 1, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium thwaitesii Cosmarium thwaitesii
Cell body 41 μm long, 22 μm wide, L/W=1.9, isthmus 19 μm wide, x 640
Cosmarium thwaitesii Cosmarium thwaitesii

Images of collecting locality: No.4, Yahei-daira-shitsugen (Yahei-daira marsh), North of Higashidaiten, Azuma mountains, Yonezawa city, Yamagata Pref., Japan, July 1, 2007 by Y. Tsukii


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