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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

 Closterium gracile
Brébisson ex Ralfs 1848

Closterium gracile 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: Cell body 90-(155-272)-275 μm long, (4-7)-8 μm wide, L/W = 25-40; slightly curved but straight at the center, tapered at both ends; cell wall smooth without bands (Illustrations of the Japanese Fresh-Water Algae, 1977).

Closterium gracile Brébisson, cell body 230 μm long, 6 μm wide, L/W=38.3, x 400, x 640, Azami-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium Closterium Closterium
Cell body 215 μm long, 6 μm wide, x 640
Closterium

Images of collecting locality: Azami-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii

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