Synonyms: Biatora brujeriana (Schaer. ex D. Dietr.) Arnold; Biatora lopadioides Th. Fr.; Biatora torellii Anzi; Lecidea brujeriana (Schaer. ex D. Dietr.) Leight.; Lecidea coarctata var. brujeriana Schaer. ex D. Dietr.; Lecidea lopadioides (Th. Fr.) Grummann; Lecidea oblita Bagl. & Carestia; Lecidea torellii (Anzi) Nyl.; Trapelia mooreana (Carroll) P. James; Trapelia torellii (Anzi) Hertel
Distribution: N - Frl (Tretiach & Hafellner 2000), Ven, TAA, Lomb, Piem (Isocrono & al. 2003), VA (Piervittori & Isocrono 1999). C - Tosc. S - Camp (Ricciardi & al. 2000).
Description: Thallus crustose, episubstratic, granular-verrucose, pale grey-brown, yellow-grey or ochraceous, sometimes partially rusty-red on iron-rich substrata, consisting of 0.1-1.4 mm wide, flat to convex, contiguous areoles. Cortex covered with an epinecral layer; medulla white, I-. Apothecia lecideine, sessile and constricted at base, 0.4-1.5(-2) mm across, with a concave to flat, brown to black-brown disc, and a very prominent, thick, flexuose, usually paler proper margin. Proper exciple 40-80 µm wide, cupulate, dark brown, of long-celled and thick-walled hyphae, C+ pink; epithecium colourless to brownish; hymenium colourless, 80-120 µm high, C+ pink; paraphyses sparingly branched, 0.8-1.2 µm thick, easily separated; hypothecium pale brown in upper part, darker brown in lowermost part. Asci 8-spored, cylindrical-clavate, thin-walled, the apical dome K/I- or K/I+ pale blue, Trapelia-type. Ascospores 1-celled, hyaline, narrowly ellipsoid, 15-27(-32) x 6-12(-14) µm. Pycnidia 0.5-0.8 mm across, immersed in thalline warts, C+ pink. Conidia narrowly bacilliform, 5-6 x c. 0.7 µm. Photobiont chlorococcoid. Spot tests: thallus K-, C-, KC-, P- (but the primordia of apothecia and the parts surrounding the pycnidia reacting C+ red); apothecial sections and pycnidia C+ pink. Chemistry: gyrophoric acid.
Note: a circumboreal-montane early coloniser of weathered siliceous rocks, also known from the Southern Hemisphere, mostly found on pebbles, or on large boulders near the soil surface in rather disturbed habitats (e.g. on track sides, in clearings of light forests, etc.), with optimum near treeline.