|  Species: 
Cell body ellipsoidal or nearly spherical,  up to 20-30 μm long, 18-26 μm wide; 
a very small papilla present (inconspicuous ?); 
a stigma circular in shape, located at equator; chloroplasts cup-shaped with large central concave; 
a pyrenoid close to posterior end of the cell body   
(Süßwasserflora von Mitteleuropa 9, Chlorophyta I, 1983). |