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© Mike Simms

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(Map updated: 11 August 2009)

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.

Key characteristics

• Shiny, yellow-brown (never dark-brown) foliose species of well-lit acid rocks, for example, siliceous sea cliffs. The swollen, wrinkled, arching lobes become covered in clusters of short, stout isidia that sometimes erode to leave white patches
• This species is believed to be more or less identical to N. delisei, except that species has discs and usually no isidia, whereas N. loxodes has isidia and no discs.

Original text submitted by Vince J. Giavarini