Genus: Highly flattened; pellicle firm; body form constant (Kudo, 1966). Chloroplasts small, discoid, pyrenoids usually absent; most species flat and leaf-shaped; often with ridges or fins running helically or longitudinally (Illustrated Guide, 1985).
Species:

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P. skujae ? μm Shishizuka Tsuchiura Ibaraki, 2003	P. skujae μm Mizuko-kaizuka p. Fujimi Saitama, 2004	P. skujae 24 x 11 μm Watarase Wetland Fujioka Tochigi, 2005	P. skujae 21 x 10 μm near Yoshino p. Mitsukaido Ibaraki, 2006
P. skujae 18 x 9 μm A. flower p. Ashikaga Tochigi, 2006

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