Species [ var. cucurbitinum ]: Cell body medium in size, (56.5-73)-83 μm long,
26-(28-30)-33 μm wide, L/W=2.5, slightly constricted at the center;
semicells semi-spindle shaped, gradually attenuated toward apex, lateral margins convex, apex broad circular;
cell wall dotted.
[ f. minor ]: Smaller than var. cucurbitinum, 50-(56-60) μm long,
22.5-25-(26.5-28) μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
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