Species [ var. cylindrus ]: Cell body cylindrical, both ends truncated with rounded corners,
(48-56)-58 μm long, 8-(11-13)-21 μm wide, L/W=5.0;
cell wall dotted, brownish in color when aged, bands present.
[ var. cuticulare ]: Smaller than var. cylindrus,
19-34 μm long, 8-10 μm wide, L/W=3;
(Illustrations of The Japanese Fresh-water Algae, 1977).
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