The epiphytic lichens around Thessaloniki (Greece) as indicators of sulphur dioxide pollution

The genus Coppinsia (lichenized Ascomycetes, Agyriaceae ) with the single species C. minutissima sp. nov. is described as new from the British Isles. This minute lichen occurs on soil and bryophytes in metal-rich habitats. It is characterized by a minute thallus, biatorine apothecia with an almost reduced but generally cupulate exciple, slightly branched and apically unthickened paraphyses, a Trapelia -type ascus, and non-septate, ovoid ascospores.