Syn.: Umbilicaria pustulata (L.) Hoffm.

On exposed, siliceous and sandstone rocks, exceptionally on the roots of Pinus, usually abundant but very sensitive to trampling.

Belgium: Mosan: RR, Ard.: AC-AR.

Luxembourg: Ard.: R, Lorr.: R.

France: Ard.: R.

Lit.: La66: 354-357, NL77: 20, NL92: 170, Diederich (1986a: 119-120).