Syn.: Buellia canescens (Dicks.) De Not., Catolechia canescens (Dicks.) Anzi

In coastal areas corticolous, most common on old trunks of Salix in nitrophilous conditions, or saxicolous, on walls; in the eastern part of the study area only saxicolous, on calcareous and sandstone rocks, usually in nitrophilous conditions.

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

Luxembourg: Ard.: RR, Lorr.: RR.

France: Mar.: AR, Boul.: AC, Pic.: AR, Mosan: RRR.

Lit.: Boul.: 68, Ba: 8, Ca: 92-93, Di: 100, DSL: 262-263, Ertz: 19, Ho: 125, La69: 106, NL84: 14, NL97: 48, Qu: 82, Barkman (1990: 14).