Species: Cell body 100-(193-310) μm long, 11-22 μm wide, L/W=9-17;
inner side nearly straight, both termini broadly blunted; cell wall smooth, transparent or yellowish in color,
bands present; chloroplasts with 4-6 pyrenoids
(Illustrations of The Japanese Fresh-water Algae, 1977).
160-280 μm long, 10-20 μm wide, L/W=18-19;
slightly curved, gradually attenuated toward both ends with obliquely truncated edges; chloroplasts with 4-9 pyrenoids
(Photomicrographs of the Freshwater Algae, vol.1, 1984).
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