Genus: Colonies of a fixed number of cells, flat, circular in shape; cell body polygonal in shape, with horn-like projections; cell wall garanulated, wrinkled or notched; chloroplasts plate-like or reticular; asexual reproduction by zoospore; sexual reproduction by isogametes (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: Colonies of 16, 32, 64 cells, subcircular or oval shaped, without perforations; basal parts of the marginal cells obtrapezoid or subpentagon; outer sides of the marginal cell with two small truncate processes having low-triangular base; cell wall granulated (Photomicrographs of the Freshwater Algae, vol. 3, 1985).

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P. integrum col. μm φ Seseragi Park Musashi-Urawa Saitama, 2002	P. integrum col. μm φ Seseragi Park Musashi-Urawa Saitama, 2002	P. integrum col. μm φ Iruma City Museum Iruma Saitama, 2003	P. integrum col. μm φ Iruma River Tsurugashima Saitama, 2003
P. integrum col. μm φ Tsuki river Ranzan Saitama, 2003	P. integrum col. 45-90 μm φ Karasu river Takasaki Gunma, 2004	P. integrum col. μm φ Todoroki g.l. Kawasaki Kanawaga, 2004	P. integrum col. 70, 110 μm φ Aquatic botanical g. Sawara Chiba, 2004
P. integrum col. μm φ Kenchomae park Toyama Toyama, 2007

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