In Mesobromion and Xerobromion communities or in dunes, on soil or mosses over calcareous rocks, also on walls, rarely over siliceous rocks.

Belgium: Mar.: R, Camp.: RRR, Mosan: AC, Ard.: RR, Lorr.: RR.

Luxembourg: Ard.: RRR, Lorr.: AR.

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

Lit.: L12: 84-85.