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:
Micrasterias ceylanica Fritsch,
cell body μm long, μm wide, L/W=, isthmus μm wide,
x 640, Kareki-numa (a pond), Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, September 24, 2008 collected by Eizaburo Tsukii, photo by Y. Tsukii
31 μm
63 μm
94 μm; x 640