Species: Colonies of 8, 16 or 32 cells, spherical in shape, covered by a mucilaginous envelope; often held in multiple coenobia by the remains of mother cell walls; cells connected to adjacent ones by 5 - 7 long, slender processes; intercellular spaces large; cells up to 24 μm diam. (Photomicrographs of the Freshwater Algae, 1996).

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C. sphaericum sphericum ? colony μm cells μm Japan, 1997

C. sphaericum sphericum ? colony μm cells μm Koshigaya Saitama, 2001

C. sphaericum sphericum ? colony μm cells μm Kodama town Saitama, 2003

C. sphaericum sphericum ? colony μm O-ike park Yabuki Fukushima, 2003

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