Trapeliopsis wallrothii (Flörke ex Spreng.) Hertel & Gotth. Schneid.
Thallus consisting of coarse warts more or less squamulose with distinct flat or convex lobes, 0.15-1.5 mm, whitish or pale greyish when dry, glaucous, celadon or pale greenish when moist, with scattered or crowded minute and elongate isidia-like protuberances (or with their dark brown scars when broken - frequently the case since they are deciduous and breakable). Not always fertile. Apothecia more or less clustered (clusters of 2 to 4 and then distorted), to 1-2 mm diam., seldom pruinose, more or less gobose when mature, disc brown-pinkish/redish at first, then brown-redish, dark red, dark brown when mature, exciple thin, flexuose, sometimes excluded when mature, paler or concolourous to the thallus. Ascospores simple, ellipsoid, 8-14 x 4-5 µm. C+ red, K-, KC+ red, Pd-. Photobiont: Chlorococcoid. Typically on well expoded to South, humus and rocky acid soils, submitted to successive humidity and drought, often at the base of protruding rocks in heaths associated with Pycnothelia papillaria. This species shows strong maritime trends, and thrives in Capes and Heads, well-exposed to wind and sun and covered with heath. Not to be confused with Solenopsora vulturiensis and with Trapelia glebulosa that develop on rocks.*