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This shiny, wrinkled, yellow-brown, foliose lichen can be found both along the coast and some way inland on well-illuminated siliceous rock, including brick wall tops and smooth, slate roofs. A feature of this species are the clusters of short, stumpy outgrowths (isidia) that spread across the thallus of swollen, arching lobes leaving whitish marks where rubbed or abraded. Throughout Ireland, mainly coastal.
Original text submitted by Vince J. Giavarini