Phymatolithon lenormandii is a common red alga.

The thallus grows to 0.6 mm [1] thick with a smooth surface.

In colour it is mauvish or pinkish[2] like a thin painted surface forming a patchwork when meeting other incrusting algae.

[3] Common, epilithic on rock and shells in the literal and sublittoral to a depth of 30m, growing best in shady sites.

World-wide from Canada USA Mexico, Japan and southern America.