Species [ var. oblongum ]: Cell body cylindrical ellipsoid, both ends broadly rounded;
laminae of chloroplasts deeply dented showing circular depressions;
108-148 μm long, 27-39 μm wide, L/W=3-4.
[ var. cylindricum W. et G.S. West ]: Smaller than var. oblongum;
60-90 μm long, 17-25 μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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