Syn.: C. callopisma (Ach.) Th. Fr.

On hard calcareous rocks, walls, gravestones, etc., in dry, sunny and nitrophilous conditions, abundant in natural and artificial habitats.

Belgium: Mar.: R, Fl.: R, Camp.: R, Brab.: AR, Mosan: AC, Ard.: RRR.

Luxembourg: Lorr.: R.

France: Mar.: RR, Boul.: RR, Mosan: RR, Lorr.: R.

Lit.: Boul.: 67, Ertz: 19, Ma: 129-134, Mü1: 156, NL93: 42, Zwaenepoel et al. (1994: 37).