Species: Colonies spherical in shape, consisting of 16 or 8 cells; cells pear-shaped, up to 26 μm in surface diam., contiguous at the center of the colony; a single chloroplast, cup-shaped, with 4-8 pyrenoids (Photomicrographs of the freshwater algae, vol. 11, 1993).

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Cell contains several pyrenoids
P. colemaniae col. 43 x 39 μm Takasaka Higashi-Matsuyama Saitama, 2002	P. colemaniae col. 49 x 39 μm cells μm Omiya Saitama, 2000	P. colemaniae col. μm cells μm Tsuchiura Ibaraki, 2003	P. colemaniae col. μm cells μm Naruto Chiba, 2003
P. colemaniae col. 36 x 31 μm Koshigaya Saitama, 2001	P. colemaniae stock Sko-2, axenic col. 34 x 32 μm Koshigaya Saitama, 2001	P. colemaniae st. Sob-1, axenic col. μm Omiya Saitama, 2000	P. colemaniae st. Sob-1, axenic Cell division Omiya Saitama, 2000
P. colemaniae col. 46 x 40 μm near Oyomi marsh Hakuba Nagano, 2004	P. colemaniae col. 34 x 27 μm Todoroki green l. Kawasaki Kanawaga, 2004	P. colemaniae ? col. 44 x 38 μm near Karakemi m. Omachi Nagano, 2005	P. colemaniae ? col. μm Kannon-numa 1 Shimogo Fukushima, 2008

Similar genus -> > Yamagishiella

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