Species: Colony of 32 cells, intercellular space absent; inner cells polygonal, outer cells with 2 horn-like projections toward various directions; cell wall covered with many granules (Illustrations of The Japanese Fresh-water Algae, 1977).

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P. muticum 128, 64 cells c.w. granulated col. μm φ Japan, 1998	P. muticum stock Sak-6a c.w. granulated ? col. μm φ Asaka Saitama, 2000	P. muticum stock Sak-6a c.w. granulated ? col. μm φ Asaka Saitama, 2000	P. muticum c.w. smooth col. μm φ Tsukuba Ibaraki, 2002
P. muticum axenic culture c.w. smooth ? col. μm φ Asaka Saitama, 2000	P. muticum 16 cells c.w. smooth ? col. μm φ Japan, 1998	P. muticum c.w. smooth ? col. μm φ Kayoicho-ike Fukuoka, 2001	P. muticum c.w. smooth ? col. μm φ near Ayu river Fujioka Gunma, 2004
P. muticum c.w. smooth ? col. 16 μm φ Karasu river g.l. Fujioka Gunma, 2004	P. muticum c.w. smooth col. μm φ Nishinasuno Tochigi, 2001	P. muticum strain Tnk-2 long horns c.w. smooth col. μm φ Nishinasuno Tochigi, 2001	P. muticum c.w. smooth col. μm φ Umi-no-nakamichi Fukuoka, 2001
P. muticum c.w. smooth col. 100 μm φ Akao Sakado Saitama, 2004	P. muticum col. 61 μm φ Kurome river Asaka Saitama, 2006	P. muticum col. 190 μm φ Uzuma-koen Tochigi Tochigi, 2006	P. muticum col. 80 μm φ Hikariga-oka p. Nerima-ku Tokyo, 2006
P. muticum col. μm φ Chiba Port Park Chiba Chiba, 2008

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