Corticolous, mainly on roadside trees and in orchards, often in well-lit situations and on bark rich in dust, always in nitrophilous communities, also lignicolous, rarely saxicolous, on concrete or other artificial substrates.

Belgium: Mar.: CC, Fl.: CC, Brab.: CC, elsewhere: C-CC.

Luxembourg: Ard.: C, Lorr.: C.

France: Mar.: AR, Boul.: AR, Pic.: R, Mosan, Ard., Lorr.: C-CC.

Lit.: Boul.: 72, Ca: 162-163, Ho: 215, La66: 471, Qu: 119, 121-122, WS: 49-50, 98.