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Gamophyceae: Zygnematales: Desmidiaceae or Closteriaceae

Closterium dianae
Ehrenberg var. arcuatum (Brébisson) Rabenhorst

Closterium dianae Species [ var. dianae ]: Cell body slightly curved, tapered toward both ends, truncated with slanted edges, small pores present at outside of both termini, inner side at center slightly convex, 150-380 μm long, 15-40 μm wide, L/W = 10-12; cell wall smooth; chloroplasts with 5-8 pyrenoids in each chloroplast (Illustrations of The Japanese Fresh-water Algae, 1977).
Cell body 160-323 μm long, 20-28 μm wide, L/W=8.3-12; chloroplasts with about 6 laminae; semicells with 4-8 pyrenoids (Photomicrographs of the Freshwater Algae, vol. 6, 1987).
[var. arcuatum] Cell body 135-300 μm long, 12-22 μm wide, L/W=9-12; (Illustrations of The Japanese Fresh-water Algae, 1977). Cell body 243-313 μm long, 17-24 μm wide, L/W=13-15; (Photomicrographs of the Freshwater Algae, vol. 9, 1989).

Closterium dianae var. arcuatum (Brébisson) Rabenhorst, (or Closterium ralfsii var. gracilius ?), cell body 310 μm long, 22 μm wide, L/W=14.1, cell wall smooth, small pores present at both ends, x 640, water reservoir, Kumakubo, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, August 21, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Closterium dianae

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