Corticolous at the base of roadside trees with an enriched bark (Fraxinus, Tilia, Ulmus, etc.), and saxicolous, on nitrophilous, natural, siliceous or calcareous sandstone rocks, but especially on artificial substrates, like roofs and old walls.

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

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

France: - .

Lit.: Ho: 211, Mü1: 158, NL93: 45, WS: 48-49, 96.