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Known by its popular name ‘blackberries and custard’, this has become one of Britain’s and Ireland’s most iconic lichens. This strongly oceanic, smooth-bark specialist has a yellow crustose thallus spotted with little black spherical discs (perithecia) that are arranged in tight constellations like small paw prints or blackberry clusters. Its association with smooth bark is very similar to that of other Pyrenula species. In western Ireland it is known from the Burren, and sites in Counties Kerry and Cork. In Ireland, it is largely confined to hazel but also occurs on holly in old, relict woodlands.
Original text submitted by Vince J. Giavarini