Syn.: Parmelia conspersa (Ach.) Ach., P. molliuscula auct. belg. p.p., non Ach.

On exposed, siliceous rocks, on walls or roofs, exceptionally on sandstone rocks, once found on dust-enriched bark.

Belgium: Brab.: RR, Mosan: AR, Ard.: AC.

Luxembourg: Ard.: AC, Lorr.: RR.

France: Mosan: RR, Ard.: AR.

The report of X. angustiphylla (Gyeln.) Hale from Belgium: by Hale (1990: 68) refers to non-isidiate forms of X. conspersa. The genuine X. angustiphylla does not occur in the study area.

Lit.: La66: 432-433, Diederich (1985a: 23), Lambinon & Sérusiaux (1985b: 207).