Species [ var. formosulum ]: Cell body small, trapezoid in shape, basal margins broadly rounded, both sides crenated with 6-7 projections, apex slightly wavy (5 waves), (34)-40-50 μm long, (34)-40 μm wide, isthmus 10-(11)15.5 μm wide; cell wall granulated; semicells with about 5 longitudinal ridges at the center, granules present on each ridge, side view ovoid (Illustrations of The Japanese Fresh-water Algae, 1977).
[var. mesochondrium]: Cell body 37.8-39 μm long, 30-31 μm wide, isthmus 9.8-11 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. formosulum: Apex wavy (5 waves); lateral margins with 6 or 7 waves; cell wall with 3 rows of granules arranged concentrically, 5 columns of granules at the center
v. formosulum 43 x 37 μm Kejo-numa 2 Osaki Miyagi, 2006	v. formosulum 40 x 35 μm rice field Ichinoseki Iwate, 2005	v. formosulum 31 x 25 μm Numa-no-hara m. Madarao highland Niigata, 2006
v. formosulum 38 x 31 μm single pyrenoid Usui river Takasaki Gunma, 2004	v. formosulum 34 x 28 μm 5 x 4 waves Omoi river Oyama Tochigi, 2006	v. formosulum 31 x 28 μm 5 x 4 waves single pyrenoid Kuroiso Tochigi, 2001
v. formosulum 36 x 29 μm Kurome river Asaka Saitama, 2006	v. formosulum 35 x 26 μm waves Shimo-muneoka Shiki Saitama, 2004	v. formosulum 35 x 26 μm waves Minuma Natural p. Midori-ku Saitama, 2007
v. formosulum 30 x 25 μm single pyrenoid Tachikawa Tokyo, 2004	v. formosulum cell μm Tokyo, 199?	v. formosulum 34 x 29 μm 5 x 4 waves single pyrenoid Japan, 1999	C. formosulum ? 34, 36 x 29 μm Asa-kawa Hachioji Tokyo, 2005
v. formosulum ? 26 x 23 μm near Karakemi m. Omachi Nagano, 2005	v. formosulum 27,29 x μm Lake Shirakaba Tateshina & Chino Nagano, 2005	v. formosulum 40 x 30 μm Ichinose-enchi Norikura highland Nagano, 2005	v. formosulum 36 x 30 μm Azami-ike 1 Norikura highland Nagano, 2007
v. formosulum ? 29 x 27 μm Maimeno-ike 3 Norikura highland Nagano, 2007	v. formosulum 32 x 28 μm single pyrenoid Hiroshima, 1998	v. formosulum ? 31 x 27.5 μm 5 x 4 waves two pyrenoids Kayoicho-ike Fukuoka, 2001	C. formosulum?? 41 x 34 μm 5 x 4 waves two pyrenoids Uruguay, 1999
var. mesochondrium: Apex flat or slightly depressed; lateral margins with 3 waves of different sizes; central granules of cell wall absent or scattered
v. mesochondrium 26 x 22 μm Ishinazaka Furukawa Miyagi, 2003	v. mesochondrium ? 28 x 23 μm 4 x 4 waves single pyrenoid Tajima Fukushima, 2004
v. mesochondrium 29 x 22 μm 26 x 20 μm single pyrenoid Saitama, 1999	v. mesochondrium 30 x 25 μm 5 x 4 waves two pyrenoids Kurihashi Saitama, 2001	v. mesochondrium ? 28 x 23 μm 4 x 4 waves 1/2 pyrenoid Kurihashi Saitama, 2001	v. mesochondrium or C. subcostatum ? 21 x 19 μm 4 x 4 waves single pyrenoid Kurihashi Saitama, 2001
v. mesochondrium ? 28 x 24 μm 4 x 4 waves near Takao-sakura p. Kitamoto Saitama, 2005	v. mesochondrium ? 24 x 20,21 μm 4 x 4 waves near Takao-sakura p. Kitamoto Saitama, 2005	v. mesochondrium ? 24 x 21.51 μm 4 x 4 waves near Lake Nakatsuna Omachi Nagano, 2008
v. mesochondrium ? 25 x 22 μm 4 x 4 waves single pyrenoid Kaga Ishikawa, 2000	v. mesochondrium 28 x 24 μm Lake Shirakaba Tateshina & Chino Nagano, 2005	v. mesochondrium ? 22 x 20 μm single pyrenoid Umi-no-nakamichi Fukuoka, 2001

Similar species -->> C. subspeciosum;

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