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).
Micrasterias thomasiana var. notata (Nordstedt) Grönblad,
cell body μm long, μm wide, L/W=,
x 640, a small pond near Yamakado marsh (Yamakado-Suigen-no-Mori), Nishi-Asai town, Shiga Pref., Japan, June 30, 2008, by Y. Tsukii
150 μm; x 400 :
94 μm; x 640