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This attractive but extremely rare lichen forms erect, dense tufts a few centimetres tall that are brown-black below, then become greyer above towards the branch tips. The non-sorediate, upright branches have spiky spinules growing out at right angles. The medulla is patchy PD+ red. The lichen favours acid sites above 250m with stable mossy boulders, especially granites. It still occurs in Wexford and Donegal but was formerly more widespread.
Original text submitted by Vince J. Giavarini