Species: Cell body spherical in shape (sometimes broaden), 12-22(-27) μm in diam.; papilla absent; chloroplast cup-shaped, with a large anterior concavity; a single spherical pyrenoid located at posterior half of the cell body; stigma elongated in shape, longitudinally located at equatorial line or slightly anterior; nucleus at anterior.
[var. macropyrenoidosa Ettl 1965]: Pyrenoid large, ellipsoidal in shape; stigma elliptical or narrowed spot (Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983).

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Pyrenoid: single, spherical in shape, located at posterior half
Stigma at equator
C. incerta ? cell 7-13 μm φ papilla absent Tachikawa Tokyo, 2001	C. incerta ? or C. lapponica ? stock Tts-3, 4 Tachikawa Tokyo, 2001	C. incerta ? or C. lapponica ? stock Tts-3 Tachikawa Tokyo, 2001	C. incerta ? or C. lapponica ? stock Tts-1 Tachikawa Tokyo, 2001
C. incerta ? 9-15 μm φ s: xxxx Kaga Ishikawa, 2000	C. incerta ? cell 12.5 μm stigma anterior Bushi, Iruma Saitama, 2002	C. incerta ? no flagellum cell μm φ Kurome river Saitama, 2000

Similar genus -> Chloromonas; Chlorococcum;

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