Species [var. intermedium]:
Cell body slightly curved, central region not swelled(inner side slightly concave),
both ends broadly truncated with slanted edges,
76-(200-300)-470 μm long,
14-(17-22)-25 μm wide, L/W=6-15;
cell wall brownish in color, with bands and lined (6-10 lines within 10 μm)
[var. hibernicum]:
Cell body straight at central region, 200-(350)-384 μm long,
14-(26) μm wide, L/W=;
(Illustrations of The Japanese Fresh-water Algae, 1977).
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