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This small, elegant, rosette-forming, foliose lichen with a yellow-green thallus and browner centre is a species of siliceous habitats, especially pebbles, granitic monuments and chippings. Its narrow, radiating lobes tightly attach it to the substratum. The thallus is spotted with large heaps of domed soredia that are K+ orange, Pd + orange. It behaves as a pioneer species on low siliceous rocks and some man-made habitats. It is relatively common on suitable habitats in Ireland.
Original text submitted by Simon Davey