Species [ var. botrytis ]:
Cell body (56-59)-65-95 μm long, (50-54)-68 μm wide, isthmus (14-18)-24 μm wide;
semicells pyramidal in shape, basal corner broadly rounded, apex flattened or slightly convex, side and apical view elliptical;
cell wall covered with uniformly arranged granules.
[var. subtumidum ]:
Cell body broader than var. botrytis, 52-80 μm long, 43-65 μm wide,
isthmus 10-15 μm wide; granules at the center of semicells larger than others
(Illustrations of The Japanese Fresh-water Algae, 1977).
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