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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 35 μm long, 22 μm wide, L/W=1.6, isthmus 20 μm wide, x 640, No. 5-1, Midagahara (bog/marsh), Tate-yama (Moutain), Tateyama town, Toyama Pref., Japan, August 23, 2006, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium
Cell body 37 μm long, 20 μm wide, L/W=1.9, isthmus 18.5 μm wide, x 640
Cosmarium

Cosmarium thwaitesii Ralfs ??, cell body 26 μm long, 16 μm wide, L/W=1.6, isthmus 14 μm wide, x 640, No. 5-1, Midagahara (bog/marsh), Tate-yama (Moutain), Tateyama town, Toyama Pref., Japan, August 23, 2006, by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

Images of collecting locality: No. 5, Midagahara (bog/marsh), Tate-yama (Moutain), Tateyama town, Toyama Pref., Japan, August 23, 2006, by Y. Tsukii

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