Syn.: C. hyperellum (Ach.) Ach.

On bark, in rather well-lit conditions, mostly on Quercus, but also on Populus and Salix.

Belgium: Brab.: RR, Camp.: RRR (†<1960), Mosan: AR, Ard.: RR, Lorr.: RR.

Luxembourg: Ard.: RRR, Lorr.: RRR.

France: Brab.: RRR. Possibly widespread as a sterile crust (especially in polluted areas).

Lit.: Ba: 8, Ho: 118, La69: 82, NL84: 12, Sé: 137, Hoffmann & Van Landuyt (1997: 28-29), Van Landuyt & Hoffmann (1996).