TYPE. CANADA. Newfoundland and Labrador. Newfoundland, near Whitbourne, 1894, A.C. Waghorne 8a (GB, lectotype selected by Dibben (1980); H, PH, isolectotypes).
Description.Life form: lichenized fungus.
Thallus crustose, yellow-grayish, epiphloedal, thin to moderately thick, the margin +/- entire; surface smooth or tuberculate, rarely rugose-plicate, shiny, continuous to rimose, poorly areolate. Vegetative diaspores absent. Photobiont chlorococcoid alga. Fertile verrucae lecanorate (less often sorediate), +/- concolorous with the thallus, few to locally numerous, occasionally crowded, rarely fused (2-3), (0.4)-0.9-(1.8) mm in diameter. Disks black, rarely pink or brown, level to less often sunken in older fruiting verrucae, frequently gray- or white-pruinose, (0.2)-0.6-(1.0) mm wide; verrucal margins heavily crenulate, more often ruptured, exposing the medulla which appears granulose-sorediate, forming a false secondary edge to the fruiting body. Ascomata pertusaroid apothecia, 1(-3) per verruca, (0.32)-0.61-(0.79) mm diam. Epithecium brown to blackish, K-; hymenium hyaline to pink; hypothecium hyaline to pallid. Asci clavate, (24-)42(-63) x (96-)153(-226) μm, 1(-2)-spored; ascospores simple, hyaline, cylindrical, often immature, (22-)38(-54) x (60-)118(-163) μm, wall and lumen K-; spore wall smooth, (2-)4(-6) μm thick. Pycnidia known; conidia 0.5-1.0 x 7-9 μm.