Peltigera horizontalis (Huds.) Baumg.

Syn.: Antilyssa horizontalis (Huds.) M. Choisy, Lichen horizontalis Huds., Peltidea horizontalis (Huds.) Ach., Peltigera zopfii Gyeln.
Lichenised.
Substrate: living mosses, calciferous soil, acidic soil (mostly on siliceous substrata), bark
Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the subalpine belt (potential vegetation: open, taiga-like forests dominated by Larix decidua and/or Pinus cembra and Rhododendron)
Note: on mosses (also epiphytic and epilithic) and humus-rich soil in the openings of humid forests, with a wide altitudinal range, but with optimum in the montane belt; widespread throughout the Alps.
Austria: Vorarlberg; Tirol; Salzburg; Kärnten; Steiermark; Oberösterreich; Niederösterreich (incl. Wien); Burgenland; Germany: Oberbayern; Schwaben; Switzerland: Appenzell; Bern; Fribourg; Glarus; Graubünden; Luzern; St. Gallen; Schwyz; Ticino; Uri; Unterwalden; Vaud; Valais; France: Alpes-de-Haute-Provence; Haute-Alpes; Alpes-Maritimes; Isère; Savoie; Haute-Savoie; Vaucluse; Var; Italy: Friuli; Veneto; Trentino Alto Adige; Lombardia; Piemonte; Valle d'Aosta; Liguria; Slovenia: Alpine and Pre-Alpine Slovenia; Trnovsky Gozd;