Syn.: Lecanora grumosa (Pers.) Du Rietz

Saxicolous, on exposed, natural, sandstone or siliceous outcrops, exceptionally corticolous, on old Fagus trees.

Belgium: Ard.: RR.

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

France:Pic.: RRR, Mosan: RRR, Ard.: RRR.

Lit.: Di: 217, L3: 32.