Syn.: Catapyrenium pilosellum Breuss, Dermatocarpon rufescens auct. p.p., non (Ach.) Th. Fr., D. trapeziforme auct. p.p., non (J. König) Trevis.

On calcareous soil, mainly in Xerobromion communities, sometimes on artificial substrates like wall crevices.

Belgium: Mosan: AR, especially in the main valleys.

Luxembourg: Lorr.: RR.

France: Mosan: RR.

Lit.: Ertz: 36, NL84: 13, Breuss (1990: 98-103).