Species: Colonies of 8, 16, 32, 64 cells, intercellular space absent; basal parts of the marginal cells polygonal, usually 4- to 5-sides; outer sides concave, incision V- or U-shaped, with two conical processes; cell wall with irregularly reticulate ridge (Photomicrographs of the Freshwater Algae, vol. 18, 1997).

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P. angulosum col. μm φ Nasu Tochigi, 2001	P. angulosum col. μm φ Omine-numa Tsukiyono Gunma, 2003	P. angulosum col. μm φ near Imori pond Myoko highland Niigata, 2004	P. angulosum col. 80 μm φ Hasu-ike Shiga highland Nagano, 2005
P. angulosum col. μm φ Kannon-numa Shimogo Fukushima, 2005	P. angulosum col. μm φ Maimeno-ike Norikura highland Nagano, 2006

Similar species -->> P. boryanum

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