Family: Unicells or cells loosely attached forming hyphae; cell body varied in shape, a constriction at the center in most species; cell walls consisting of two or more parts, with small pores and various ornaments (Illustrations of The Japanese Fresh-water Algae, 1977).
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).
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M. foliacea
89 x 89 μm
Hiroshima, 1998
Movies 
M. foliacea
81 x 88 μm
USA, 1999
M. foliacea
86 x 83 μm
Kasuga
Fukuoka, 2001
