Syn.: Bacidia umbrina (Ach.) Bausch

Most commonly saxicolous on siliceous, natural outcrops, also corticolous, in polluted areas, on bark rich in dust.

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

Luxembourg: Ard.: R, Lorr.: AR (C as an epiphyte in the SW part, absent elsewhere).

France: Ard.: RRR, Lorr.: RR.

Lit.: Di: 210, NL84: 17, NL87: 23, NL92: 174, VGH: 114, Zwaenepoel et al. (1994: 37).