Trapeliopsis flexuosa (Fr.) Coppins & P. JamesThallus crustose, episubstratic, grey-green to sordid olive-green, dull, granulose-areolate, mostly sorediate, the central parts of 0.008-0,25 mm wide granules, the peripheral parts of up to 0.4 mm wide, flattened areoles. Soralia punctiform, often concentrated in the center of areoles, rarely confluent, 0.1-0.5 mm diam, with farinose to finely granular, grey-green to dark blue-green soredia. Apothecia relatively rare, lecideine, round to mostly irregular in outline, sessile with a constricted base, 0.3-0.7(-1) mm across, with a grey-green to greenish black (rarely whitish or pale brown in shade-forms), dull, epruinose, flat to slightly convex disc, and a more or less prominent proper margin. Proper exciple pseudoparenchymatous, of densely entangled, pale brown, short-celled hyphae; epithecium sordid olive-brown, 10-25 µm high; hymenium colourless to rarely pale brown, 40-50 µm high; paraphyses branched and anastomosing, the apical cells 1-2 µm wide, sometimes brownish; hypothecium colourless to pale ochre. sometimes with brownish, Ascospores: 1-celled, hyaline, ellipsoid, (5.5-)7-9.5(-11) x 2.5-4.5 µm. Pycnidia globose, immersed, 75-125 µm in diam., the wall colourless to pale brown. Conidia bacilliform, 5.5-7 x 0.5-1 µm. Spot tests: thallus K-, C+ red, KC+ red, P-, UV+ whitish. Chemistry: gyrophoric acid.