Xanthoria
Xanthoria (order Teloschistales) A genus of lichens in which the thallus is foliose, usually bright yellow or orange in colour, and is attached to the substrate by rhizines on the lower surface. X. parietina is perhaps the best-known of all lichens; its bright yellow rosette-like thalli, each bearing crowded apothecia in the centre, are a familiar sight on farm buildings, on rocks by the sea, etc. This species is moderately tolerant of air pollution.
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Xanthoria