Lepraria atlantica, a new species from the British Isles

Lepraria atlantica is described as new from acidic rocks in the British Isles; it contains porphyrilic acid, cf. rangiformic acid or rarely cf. roccellic acid, and atranorin. It differs from L. cacumimim in the diffuse, powdery thallus. It is morphologically similar to L. jackii, but differs in the possession of porphyrilic acid.