Species [ var. circulare ]:
Cell body large, nearly circular or slightly broad elliptical in shape, (51-75)-95 μm long,
48-90 μm wide, isthmus 20-(22-28)-34 &3956;m wide;
semicells semicircular, basal corner rounded, side view ovoid or nearly circular, apical view elongated elliptical;
cell wall covered with small dots; chloroplasts with 2 pyrenoids.
[ f. minor ]: Cell body 33-35-(40) μm long, 35-(47) μm wide,
isthmus 12-14-(17) μm wide
(Illustrations of The Japanese Fresh-water Algae, 1977).
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