Species: Cell body broad ellipsoidal or nearly spherical, 18-35 μm in diam.; papilla broad with flattened apex; chloroplast cup-shaped; a pyrenoid horseshoe-shaped, located beneath equatorial line or slightly posterior; stigma longitudinally elongated, thin, located at equator or slightly anterior; nucleus at anterior half of the cell body.
[ var. globulifera (Korschikoff) Korschikoff 1938]: Papilla narrower and more protruded; cellwall thick; with several pyrenoids irregular in shape.
[ var. perforata Vlk 1940]: Pyrenoid ring-form.
[ var. longirubra Ettl 1976]: Stigma large, elongated, stick-like in shape, longitudinally located at anterior half of the cell; papilla more broad and short; a pyrenoid elongated, curved as half-ring (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).
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Similar genus -> Chloromonas; Chlorococcum;
C. monadina
v. longirubra
papilla present
horse-shoe pyr.
cell 22 x 19 μm
Akigase Park
Saitama, 2002
C. monadina ?
papilla absent ?
horse-shoe pyr.
cell 16 x 12 μm
Kodaira Central Park
Tokyo, 2003
C. monadina ?
cell 16 x 12 μm
papilla present
Kanayama g.p.
Kiyose
Tokyo, 2006
