On natural, calcareous or siliceous outcrops, and on artificial substrates (walls, asbestos, soil in industrial wasteland), often over mosses.

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

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

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

Some specimens are difficult to separate from L. schraderi.

Lit.: L8: 45, Van den Broeck et al. (2008).