Order & Family: Floating unicells or a colony embedded in a matrix;
no differentiation of apical and base structures; only one family.
Genus: Colonies consiting of orderly arranged cells; diameter of cells at transverse section is the same as its length (Illustrations of The Japanese Fresh-water Algae, 1977). Species: |
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
