|  Species: 
Cell body curved in various degree, slightly swells at the center, 
90-(117-256)-260 μm long, 14-(19-34)-45 μm wide, 
L/W=6-8, cell wall smooth, transparent or brownish; chloroplasts with 2-4 laminae; 
semicells with 4-8 pyrenoids  (Illustrations of The Japanese Fresh-water Algae, 1977). 
Cell body 140-250 μm long, 28-34 μm wide, L/W=5-8; 
cell wall smooth; chloroplasts with 5-6 laminae; semicells with 3-4 pyrenoids
(Photomicrographs of the Freshwater Algae, vol. 1, 1984). |