A distinctive, crustose lichen that forms greenish or glaucous grey thalli that, when young, consists of separate, rounded areoles, each with an apothecium in the centre. On becoming mature, the areoles may merge and become paler. The apothecia are immersed and frequently have a blue-white pruina that covers the black discs.
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In Scotland, Aspicilia contorta has a local, mainly eastern, distribution where it is found on calcareous rocks, concrete and mortar, and manmade structures such as gravestones and kerbstones. BLS distribution map
scottishlichens.co.uk 