 
 
|  Genus: 
Cell body flat, large, variable in shape, longer than wide; strong constriction at center; 
each semicell with several notches; cell wall with many short spines 
(Illustrations of The Japanese Fresh-water Algae, 1977). Species: 
 | 
 100 μm
 100 μm
 200 μm
 200 μm
 300 μm; x 200 :
 300 μm; x 200 : 
 50 μm
 50 μm
 100 μm
 100 μm
 150 μm; x 400
 150 μm; x 400
 
 
 31 μm
 31 μm
 63 μm
 63 μm
 94 μm; x 640
 94 μm; x 640
 
 
 
 50 μm
 50 μm
 100 μm
 100 μm
 150 μm; x 400 :
 150 μm; x 400 : 
 31 μm
 31 μm
 63 μm
 63 μm
 94 μm; x 640
 94 μm; x 640
 
 
Micrasterias foliacea Bailey: Cell body small, nearly rectangular, length = width; strong constriction at center; semicell also rectangular with indentations (notches); a paired protrusion at the apical end; 73-78 μm long, 67-70 μm wide, constriction 14 μm wide; cells attached antero-posterially to form a band-like colony (Illustrations of The Japanese Fresh-water Algae, 1977).