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Chlorophyta: Gamophyceae: Zygnematales: Desmidiaceae

Closterium cornu
Ehrenberg var. cornu

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 [ var. cornu]: Cell body slightly curved, tapered at both ends, but inner side at center straight, 95-160 μm long, 5-(7.8-13) μm wide, L/W = 16-17; cell wall smooth; chloroplasts with 3-4 pyrenoids (Illustrations of The Japanese Fresh-water Algae, 1977).

Closterium cornu Ehrenberg var. cornu, tape No. 0056, time code 2237, cell body 180 μm long, 13 μm wide, L/W =13.8, a chloroplast with 3 pyrenoids in each semicell, Kagami Pond, Otawara City, Tochigi Pref., Japan, September 2000, by Y. Tsukii

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