Species:
Cell body large in size, 100-112 μm long, 65-72 μm wide,
isthmus 22-26 μm wide, L/W=1.6; semicells broad oviform, rounded at base;
cellwall covered with conical granules, gradually becoming smaller toward the center of the semicells;
small dots present between granules
(Illustrations of The Japanese Fresh-water Algae, 1977).
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