Species: Cell body medium in size or larger, 65-86 μm long, 51-63 μm wide,
L/W=1.25, isthmus 19-32.5 μm wide; semicells pyramidal or trapezoid in shape with flattened apex;
cellwall covered with large granules (including apex, c.f.
C. pseudomagnificum);
many triangular pores present at the center of the semicells
(Illustrations of The Japanese Fresh-water Algae, 1977).
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Images of collecting locality:
No.6, Kashibaru marsh, Karatsu city, Saga Pref., Japan, November 22, 2006 by Y. Tsukii