Thallus yellow-orange, foliose, with marginal labriform soralia/groups of blastidia. Apothecia rare. Mostly saxicolous, on Ca-enriched, often dusty siliceous rocks. Closely related epiphytic X. huculica has helmet-shaped soralia, shorter and wider lobes and more abundant rhizines. In the Czech Republic, X. fallax is found from lowlands to middle altitudes, it is more abundant in areas with well-lit siliceous rocks, typically in river valleys (e.g., Vltava, Berounka, Jihlava, Oslava rivers). It is also known from limestone rocks of the Moravian karst. Herbarium material containing specimens from bark probably represents X. huculica, not distinguished previously, and requires revision.taxonomic classification: most frequented synonyms:Xanthoria fallax
All records: 79, confirmed 70. One click on a selected square displays particular record(s), including their source(s).