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This species, though minute, is not uncommon. It consists usually of flattened scales (squamules) that are grey when dry, changing to green when wet. It is probably most frequently encountered on wall tops amongst moss and detritus. However, it also occurs on basic-barked trees as well as stable soils such as dunes. It has discs, which are spherical to barrel-shaped, that can only be seen with a hand lens. It is not uncommon, being scattered throughout Ireland in suitable habitats. Look for it lodged amongst mosses on the mortar of old walls.
Original text submitted by Simon Davey