Lepra amara forme détriticole. = Pertusaria amara forme détriticole.

       This taxon is characterized by its occurence in the ground in the aerohaline moors of the Pointes and Caps very exposed. Thallus relatively thick, whitish, emerging on the ground from woody debris from heather (Erica, ...), entirely covered (except at the extreme margin) with large more or less spherical warts, sometimes with a truncated and flattened top or then in the form of apothecia, covered or not with soralia, whitish to whitish pinkish, bitter flavor. Rare and poorly formed apothecia sometimes at the top of warts in the form of large brownish dots. Spores not seen in apothecia that appear sterile.This particular and well-characterized taxon (under study) seems to be related to Pertusaria amara var. slevisciensis in the interpretation of British authors (at least partially) who report it in a similar habitat of the Channel Islands and Scilly.