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