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Foliose lichen, grey, smooth, shiny with loosely attached, narrow, semi-inflated fan-shaped lobes, margins divided, turned-up and frequently white-powdery (sorediate) on the underside; blunter edges often black dotted. Lower surface, pale brown, wrinkled towards the centre. On acid-barked trees (branches and twigs mainly), wooden posts, rocks and peaty soils.
Original text submitted by Vince J. Giavarini