On calcareous rocks, on soil or over mosses, often in Mesobromion communities, rarely on walls.

Belgium: Mar.: RRR, Fl.: RR, Brab.: RRR, Mosan: AR.

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

France: Mar.: RR, Brab.: RRR, Lorr.: RR.

Lit.: L8: 43-44, Jørgensen (1994: 25).