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).

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P. landekiensis 71 x 43 μm Kejo-numa Furukawa Miyagi, 2003	P. landekiensis μm Japan, 199?	P. landekiensis 40 x 8 μm Futayo-no-ike Haguro mountain Yamagata, 2006	P. landekiensis 37 x 27 μm Uruguay, 1999
P. landekiensis ? 26 x 19 μm Saitama, 1999	P. landekiensis ? 26 x 21 μm Yamaguchi Univ. Yamaguchi, 2004

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