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This shy, foliose lichen with grey to brown thallus and upturned rounded lobes edged with granular soralia that can spread in ridges across the thallus, occurs most often on the bases of mossy trees, especially ash or hazel or in willow swamp. It may also occur on mossy rocks in the west and south-west. It is frequently associated with woodland that has long continuity. It is most often seen in west and south-west Ireland. In the east, it is rarer.
Original text submitted by Simon Davey