Species [ var. ulna ]: Cell body slightly curved, both lateral margins parallel, slightly tapered toward ends,
both ends broadly truncated, 170-(192-462)-500 μm long, 10-
(11-22)-23 μm wide, L/W=15-20; cell wall brownish in color,
striated (10-11/10 μm), bands present; 6-15 pyrenoids in each semicell.
[ var. recurvatum ]: Thinner than var. ulna, recurved at both ends,
248-(298)-345 μm long, 9-11-(18) μm wide, L/W=30;
cell wall smooth without striae
(Illustrations of The Japanese Fresh-water Algae, 1977).
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