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This is a small crustose lichen of the ‘bark pimple’ tribe with a creamy-white to grey, slightly powdery thallus. It can look rather similar in the field to Anisomeridium ranunculosporum. It differs, however, in the thread-like spores (< seven-septate) not pinched at the septa, and in having a thin dark brown layer (involucrellum) over the perithecial disc, rather than a thick black one. It occurs mostly on holly and birch and is scattered in Ireland.
Original text submitted by Vince J. Giavarini