Mainly on isolated trees (e.g. Fraxinus), in slightly nitrophilous conditions.

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

Luxembourg: Ard.: R, Lorr.: AR.

France: Pic.: R.

Lit.: Boul.: 72, Ho: 213, La66: 472-473, WS: 47, 94.