Corticolous on old roadside trees (mainly on Fraxinus, Populus, Tilia and Ulmus).

Belgium: Mar.: AR, Fl.: AR, Brab.: AR (†?1962), Mosan: AR, Ard.: AC-AR, Lorr.: R.

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

France: Mar.: RRR, Boul.: RR, Pic.: R (1989), Brab.: RRR (1954), Mosan, Ard., Lorr.: AR.

Until the early eighties, well-developed populations with exuberant specimens occurred throughout the S part of the study area. All these populations are now gone or in a very poor condition.

Lit.: Boul.: 73, Ho: 231, L4: 20, La66: 450, WS: 57-58, 111.