Syn.: U. comosa (L.) Vain.

On any kind of deciduous trees in forests or in wooded peat bogs, also on roadside trees, exceptionally saxicolous.

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

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

France: Mar.: RRR, Boul.: RRR, Ard.: AR.

Lit.: Boul.: 73, Ca: 128, Ho: 241, 629, La66: 458-459, NL84: 18, WS: 60, 115, Lambinon (1968b: 405).