Syn.: Lecanora crenulata auct., non Hook.

Saxicolous, on walls (sandstone, mortar, etc.) or gravestones, rarely on natural, calcareous rocks, exceptionally corticolous, on the base of an old Sorbus in a pasture.

Belgium: Fl.: R, Camp.: RRR, Brab.: RR, Mosan: R, Ard.: RRR.

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

France: Mar.: R, Boul.: RR, Pic.: RRR, Lorr.: RR.

Lit.: Boul.: 69, L9: 16-17, NL92: 155, VGH: 114, Zwaenepoel et al. (1994: 37).