Ochrolechia arborea (Kreyer) Almb.

Syn.: Ochrolechia sordidogrisea (Erichsen) E. Schreiner & Hafellner, Pertusaria arborea (Kreyer) Zahlbr., Pertusaria myriosora Erichsen, Pertusaria sordidogrisea Erichsen, Variolaria lactea Wahlenb. var. arborea Kreyer
Lichenised.
Substrate: bark
Altitudinal range: from the submediterranean/colline belt (potential vegetation: mixed deciduous forests dominated by Quercus and Carpinus) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: a mainly temperate lichen found on isolated deciduous trees with mineral-rich bark. The species is more frequent in Fennoscandia and Central-Eastern Europe, being rare in the western and southern parts of the continent; widespread throughout the Alps.
Austria: Vorarlberg; Tirol; Salzburg; Kärnten; Steiermark; Oberösterreich; Niederösterreich (incl. Wien); Burgenland; Germany: Oberbayern; Switzerland: Bern; Glarus; Graubünden; Luzern; Schwyz; Ticino; Uri; Unterwalden; Valais; France: Alpes-de-Haute-Provence; Alpes-Maritimes; Isère; Italy: Friuli; Veneto; Trentino Alto Adige; Lombardia; Piemonte; Liguria; Slovenia: Alpine and Pre-Alpine Slovenia; Trnovsky Gozd;