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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C. decoratum 70 x 50 μm Omine numa Tsukiyono Gunma, 2003	C. decoratum 71 x 61 μm Kodanuki marsh Fujinomiya Shizuoka, 2006	C. decoratum 64 x 50 μm Omine numa Tsukiyono Gunma, 2006	C. decoratum ? 84 x 60 μm Kashibaru marsh Karatsu Saga, 2006
C. decoratum ? μm Omine numa 4 Tsukiyono Gunma, 2007.10	C. decoratum or C. pseudomag. ? 83 x 66 μm near Omine numa Tsukiyono Gunma, 2007	C. decoratum or C. pseudomag. ? 76 x 55 μm Oze marsh Katashina Gunma, 2006	C. decoratum or C. pseudomag. ? μm Numappara marsh Kuroiso Tochigi, 2003
C. decoratum ? μm Shibayachi m.1 Odate Akita, 2007

Similar species -- >> C. pseudomagnificum;

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