Lepra leucosora ss. auct. brit. =Pertusaria leucosora ss. auct. brit.

     Thallus crustose, thick, plaque-forming up to 10 cm in diameter, cracked and areolate, pale grayish, dirty grayish pale, strongly warty surface with 0.5-1.5 mm more or less rounded warts, with rounded soralia especially towards the center, no prothallus but a margin sometimes a little zoned. Thallus: K-, KC-; medulla: C-, K + dirty brown, P + yellow then reddish. Taken in the sense of the British authors, this taxon, probably synonymous with Lepra aspergilla, occurs on low acid rocks sheltered by the sea.