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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium setaceum
Ehrenberg ex Ralfs 1848

Closterium setaceum Species [var. setaceum]: Cell body quickly attenuated toward both ends (cf. C. ralfsii), each extended part longer than spindle-shaped part at middle (cf. C. kuetzingii), 150-(252-528)-600 μm long, 6-(8.6-17) μm wide, L/W=30-33; cell wall transparent or slightly yellowish, finely striated (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. setaceum;

Closterium setaceum Ehrenberg, cell body 344 μm long, 9 μm wide, L/W=38.2, x 200, x 400, x 640, No.2, Mi-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium setaceum Closterium setaceum Closterium setaceum Closterium setaceum

Images of collecting locality: No.2, Mi-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii

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