Buellia forming black apothecia immersed in the grey-white thallus with sharply cropped areoles (so-called rimose thallus). It resembles B. aethalea and B. stellulata, but differs in composition of secondary metabolites in the thallus: B. spuria contains atranorin, stictic acid and its derivatives. Moreover, from B. stellulata it may be distinguished by amyloid medulla (react violet with iodine). The lichen grows on siliceous rocks in areas with a warmer climate. Within Europe, it is more common in the Mediterranean than in the central part where it is rare (Scheidegger 1993). There is only a single unverified historical record for the Czech Republic, from a sandstone in the Hradec Králové region (Novák 1913).
Literature: Scheidegger C. (1993): A revision of european saxicolous species of the genus Buellia De Not. and formerly included genera. – Lichenologist 25: 315–364. Novák J. (1913): Lišejníky okolí Královéhradeckého. – Sborník Klubu přírodovědeckého Praha 1912: 1–15.
taxonomic classification:Ascomycota → Lecanoromycetes → Caliciales → Caliciaceae → Buellia
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