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This tiny micro-lichen invades the surfaces of smooth, siliceous pebbles, shrubby stems and dry worked timber forming black speckles on a thin grey thallus overlying a lower stratum of dark grey prothallus. This gives it the appearance of a three-tone mosaic. The black speckles are the discs (average size = 0.2–0.4mm diam.) most of which remain flat. In a squash of the discs in K, prepare to see green, blue, and sometimes, reddish pigments. The spores are simple. In Ireland (where flinty rock is rare), the species is sparingly distributed throughout.
Original text submitted by Vince J. Giavarini