Species [ var. venus ]: Cell body small, strongly curved, inner side not convex, both ends pointed,
48-(54-60)-85 μm long, 6-(9)-11 μm wide, L/W=8-9;
cell wall smooth, transparent or brownish in color; 1-2 pyrenoids in each chloroplast, one lamina visible.
[ var. incurvum (Brébisson) Krieger ]: Smaller than var. venus,
30-(50-73)-80 μm long, 6-(8.4-11)-14 μm wide, L/W=5-7
(Illustrations of The Japanese Fresh-water Algae, 1977).
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