Species [ var. furcatospermum ]: Cell body 18-(19.6-29) μm long, 16.5-(18-25) μm wide, isthmus 5.6-8.4 μm wide; semicells semicirucular with flattened apex, margins wavy (laterally 4-5 waves, apically 4 waves); two rows of granules radially arranged within the margin; central region smooth (lacks granules or other ornaments).
[ var. koreanum Skvortzow ]: 31-32 μm long, 25-28 μm wide, isthmus 8-11 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

v. furcatospermum 24 x 21 μm Higashi-sano Hakuba Nagano, 2004	v. furcatospermum 19 x 16 μm near Omine mt. Minakami Gunma, 2007	v. furcatospermum 20 x 16 μm Omine-numa Minakami Gunma, 2007	v. furcatospermum 19 x 17 μm Rice field Omachi Nagano, 2008
C. furcatospermum ? v. furcatospermum 21 x 18 μm Norin Park Kawamoto Saitama, 2004	v. furcatospermum or C. formosulum ? 24 x 21 μm rice field Ichinoseki Iwate, 2005	C. furcatospermum ? or C. impressulum ? 16 x 12-13 μm Omine-numa Tsukiyono Gunma, 2003	C. furcatospermum ?? v. furcatospermum 26 x 24 μm Higashi-Urawa Saitama, 2001
C. furcatospermum v. furcatospermum 19 x 16 μm Kareki-numa Nikko Tochigi, 2008

Similar species -->> C. subcostatum (26- μm); C. formosulum;

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