Arthonia dispersa (Schrad.) Nyl.

Syn.: Arthonia epipasta (Ach.) Körb., Arthonia minutula Nyl., Opegrapha dispersa Schrad., Opegrapha epipasta (Ach.) Ach.
Lichenised.
Substrate: bark
Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)
Note: a holarctic species found on smooth, nutrient-rich bark, e.g. of Fraxinus. It belongs to a difficult complex which still awaits elucidation.
Austria: Salzburg; Kärnten; Steiermark; Oberösterreich; Niederösterreich (incl. Wien); Burgenland; Switzerland: Bern; Graubünden; Ticino; Vaud; France: Drôme; Vaucluse; Var; Italy: Friuli; Veneto; Trentino Alto Adige; Lombardia; Piemonte; Valle d'Aosta; Slovenia: Alpine and Pre-Alpine Slovenia;