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Known from several counties at opposite ends of Ireland, L. caesiosora is an occasional sorediate crustose lichen of acid rocks and large, firmly grounded boulders, especially on vertically orientated surfaces. Rarely with discs, the white-grey, K+ yellow thallus of convex areoles (occasionally accompanied by dark brown granules), and clumps of paler soredia, is usually sufficient to distinguish it.
Original text submitted by Vince J. Giavarini