Lecanora horiza (Ach.) Linds.

Syn.: Lecanora laevis Poelt, Lecanora parisiensis Nyl., Lecanora subfusca (L.) Ach. f. horiza 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 mainly Mediterranean species found on smooth bark of isolated broad-leaved trees; much rarer in the Alps than in the Mediterranean mountains.
Austria: Salzburg; Kärnten; Steiermark; Niederösterreich (incl. Wien); Switzerland: Glarus; Graubünden; St. Gallen; Ticino; Unterwalden; Valais; France: Alpes-de-Haute-Provence; Alpes-Maritimes; Isère; Haute-Savoie; Vaucluse; Var; Italy: Liguria; Slovenia: Alpine and Pre-Alpine Slovenia; Trnovsky Gozd;