Species
[var. digitus]: Cell body 130-300 μm long,
40-84 μm wide, L/W = 3-4; cell wall smooth.
[var. lamellosum]: Longer than v. digitus, both sides parallel;
cell body 140-416 μm long, 32-60 μm wide, L/W = 5-8.
[var. naegelii]: Smaller than v. digitus, both ends broadly rounded;
cell body 100-200 μm long, 25-36 μm wide, L/W = 4-5.
[var. rectum]: Larger than v. digitus, tapered to both ends;
cell body 300 μm long, 48 μm wide, L/W = 6.3
(Illustrations of The Japanese Fresh-water Algae, 1977).
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