Species [ var. globosum ]: Cell body small in size, slightly constricted at the center, 30-39 μm long, 20-28 μ wide, L/W=1.5, isthmus 19-26 μm wide; outline of semicells 2/3 of circle, apex rounded; cell wall dotted.
[ var. wollei ]: Constriction stronger than that of var. globosum, 38.5-(42-43) μm long, 24-(33-39) μm wide, L/W < 1.5, isthmus 21-(31-37) μm wide, cell wall covered with small pores.
[ var. subaltum ]: Longer than var. globosum, 31 μm long, 20 μm wide, isthmus 17 μm wide; cellwall dotted.
[ var. minus ]: Smaller than var. globosum, 17-(21-22.5) μm long, 13-(15.4)-18 μm wide, isthmus 9.5-(9.8)-15 μm wide.
[ f. minor ]: 16.8-27.4 μm long, 10.6-16.7 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

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var. globosum: Cell body 30-39 x 20-28 μm, L/W=1.5
C. globosum var. globosum ? 36 x 21 μm L/W=1.7 Tanohara marsh Shiga highland Nagano, 2004	C. globosum var. globosum 33 x 21 μm L/W=1.6 Tanohara marsh Shiga highland Nagano, 2005	C. globosum var. globosum 32-33 x 20-21 μm L/W=1.6 Tanohara marsh Shiga highland Nagano, 2006	C. globosum var. globosum 30-36 x 20-22 μm L/W=1.5, 1.6 Hikage marsh Shiga highland Nagano, 2005
C. globosum var. globosum 30 x 18 μm L/W=1.7 Iroha-numa Zao mountain Yamagata, 2006	C. globosum var. globosum ? 34 x 21.5 μm L/W=1.6 Mida-ga-hara 9 Gassan (mt) Yamagata, 2006	C. globosum var. globosum ? 31 x 19 μm L/W=1.6 Omine-numa 6 Minakami Gunma, 2007	C. globosum var. globosum ? μm L/W= Oh-numa m.3 Hachimantai Akita, 2007
var. subaltum: Cell body elongated (31 x 20 μm), cellwall dotted
C. globosum var. subaltum 33 x 19 μm L/W=1.7 Kannon-numa Shimogo Fukushima, 2005	C. globosum var. subaltum 30 x 17.5 μm L/W= Omine-numa Minakami Gunma, 2006	C. globosum var. subaltum 34.5 x 21 μm L/W=2.0 Iroha-numa 2 Zao mountain Yamagata, 2006	C. globosum var. subaltum 33 x 20 μm L/W=1.7 Iroha-numa Zao mountain Yamagata, 2005
C. globosum var. subaltum 31 x 20 μm L/W=1.6 Iroha-numa 3 Zao mountain Yamagata, 2006
f. minor: Cell Cell body 17-27 x 11-17 μm
C. globosum f. minor ? 27 x 16.5 μm L/W= Hachiman-numa m Hachimantai Iwate, 2006	C. globosum f. minor ? 31 x 17 μm L/W= small marsh Azuma mt. Yamagata, 2007

Similar species -- >> C. diplosporum; C. oblongum;

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