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This species has not been recorded in Ireland since 1865 and is now considered to be extinct. It should be searched for. Its chief substrata are wooden posts and untreated wooden fencing. Wood is barely used as exterior fencing in Ireland today because of the high rainfall and has been replaced in many parts with concrete copies. C. inquinans is easy to recognise: it has a pale grey, warted thallus scattered with sooty-black discs (to 2mm diam.) surrounded by a thin, white disc margin. It occurs frequently on the tops of posts where the wood softens earlier. If touched with a fingertip, the discs leave a black stain the colour of charcoal.
Original text submitted by Vince J. Giavarini