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. papillifera
v. papillifera
135 x 110 μm
Higashi-sano
Hakuba
Nagano, 2004
M. papillifera
v. papillifera
130 x 114 μm
Aka-ike
Madarao highland
Niigata, 2006
M. papillifera
v. glabra
81 x 72 μm
USA, 1999
M. papillifera
v. ?
μm
near Karakemi marsh
Omachi
Nagano, 2005
M. papillifera
v. papillifera
μm
Kashibaru marsh
Karatsu
Saga, 2008
M. papillifera
v. papillifera
μm
Kareki-numa
Nikko
Tochigi, 2008
M. papillifera
v. papillifera
μm
Ko-numa 2
Minakami
Gunma, 2008
