Syn.: Physcia orbicularis (Neck.) Poetsch, P. obscura (Humb.) Fürnr., P. cycloselis (Ach.) Vain., P. virella (Ach.) Flagey

Corticolous, mostly on isolated trees, also saxicolous, mainly on artificial substrata, very common in nitrophilous communities.

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

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

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

Lit.: Boul.: 72, Ca: 155-156, Ho: 203, La66: 482-483, Qu: 113, 116-117, WS: 46, 92.