Syn.: Parmelia protomatrae Gyeln.

On a dry and sunny, natural, slightly calcareous, siliceous outcrop.

Belgium: Mosan: RRR.

Luxembourg: - .

France: - .

Lit.: Schl: 240 (probably a mistake for X. somloënsis, see L8: 4), Lambinon & Sérusiaux (1985b: 209-210).