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This attractive species, which is very similar to the leafy Parmelia taxa, may be known at once by its large, grey thallus (to 10cm wide) and presence of white dots (technically named pseudocyphellae) across the surface of the lobes. In well-grown specimens the edges of the lobes produce powdery soredia. The underside is black towards the centre with a pale brown, shiny margin; lobe tips lack the marginal hairs (cilia) of Parmotrema perlatum (described elsewhere). Well-illuminated acid-barked trees (for example, hazel and sallow) in damp, mossy woodlands; often by rivers or loughs. Local. Throughout Ireland.
Original text submitted by Vince J. Giavarini