Species: Cell body large, 84-105 μm long, 63-74 μm wide, L/W=1.3, isthmus 25-30 μm wide; semicells pyramidal in shape with flattened apex; cellwall covered with large conical projections except the flattened apex; many circular pores present at the center of the semicells (sizes gradually declined from center to margins) (Illustrations of The Japanese Fresh-water Algae, 1977).

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C. pseudomagnificum μm Hanadate S.W. Yuri-Honjo Akita, 2008	C. pseudomagnificum μm Utsubo-numa Zao mountain Yamagata, 2008	C. pseudomagnificum μm Numappara marsh Nasu-shiobara Tochigi, 2007	C. pseudomagnificum? 76 x 55 μm Numappara marsh Kuroiso Tochigi, 2003
C. pseudomagnificum 80 x 63 μm Ichinose-enchi Norikura highland Nagano, 2006	C. pseudomagnificum 98 x 72 μm 94 x 68 μm Kabuto-yama Nishi-no-miya Hyogo, 2004	C. pseudomagnificum μm Kashibaru m.3 Karatsu Saga, 2008

Similar species -- >> C. decoratum;

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