Species: Colony of 4-32 cells, intercellular space present; marginal cells attached only at the basal part, with deep, broad incision forming two dichotonous, V-shaped lobes; inner cells H-shaped; cell wall smooth (Photomicrographs of the Freshwater Algae, vol.8, 1988).

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P. biradiatum Higusa-numa Hikari Chiba, 2003

P. biradiatum ? Saitama, 1999

Similar species -->> P. boryanum; P. angulosum;

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