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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium sp.

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Closterium libellula Genus: Cell body crescent in shape (long, curved, tapered at both ends); cross section rounded; cell wall smooth or with longitudinal lines, bands on the cell wall in some species; chloroplast laminae ridged and radially arranged, which makes cross section star-shaped; pyrenoids aligned or scattered (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:

Closterium sp. similar to C. intermedium Ralfs var.intermedium, but shape of termini is quite different, cell body 210 μm long, 15 μm wide, L/W=14.0, cell wall striated, x 400, x 640, Kumakubo, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, December, 2005, collected by Eizaburo Tsukii, photo 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 intermedium Closterium intermedium Closterium intermedium Closterium intermedium Closterium intermedium Closterium intermedium

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