Rhizocarpon ridescens (Nyl.) Zahlbr.

Rhizocarpon ridescens (Nyl.) Zahlbr.

Syn.: Lecidea ridescens Nyl.

Lichenised.

Substrate: metal-rich siliceous rocks, siliceous rocks

Altitudinal range: from the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies) to the nival belt (above the lower limit of perennial snow and glaciers)

Note: on iron-rich siliceous rocks, mostly under overhangs, with optimum near or above treeline; easily overlooked, being always sterile.

Austria: Vorarlberg; Tirol; Salzburg; Kärnten; Steiermark; Switzerland: Graubünden; Ticino; Valais; France: Alpes-de-Haute-Provence; Haute-Savoie; Italy: Friuli; Trentino Alto Adige; Lombardia; Piemonte;

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