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).

Phacus torta 5 clips cell 48 x 39 μm tail 23 μm anterior narrowed Japan, 1999	Phacus caudatus 2 clips 28 x 16 μm Japan, 1999	Phacus pylum 1 clip 40 x 17 μm Japan, 1998
Phacus pleuronectes 5 clips 46 x 37 μm Japan, 1999	P. curvicauda ? 2 clips μm Japan, 199?	P. acuminatus 1 clip 31 x 27 μm Japan, 1999

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