TYPE. CANADA. Nova Scotia, Cape Breton Island, Victoria Co., Baddeck, on tree trunks, 06.VIII.1952, I. Mackenzie Lamb 1953 (CANL 11613, holotype as part of a mixed collection)
Description.Life form: lichenized fungus.
[modified from Dibben 1980] Thallus gray to yellowish or greenish gray, epiphloedal, thin to moderately thick; margin +/- entire and unzoned. Surface smooth or verrucose, dull, and fissured to +/- areolate; areoles poorly formed, (0.2-)0.5(-0.8) mm diam. Vegetative diaspores absent. Fertile warts generally flat-topped, numerous, dispersed or locally crowded and occasionally 2-3 fused, (0.4-)1.0(-2.5) mm diam. Ostioles 1 or 2-8(-12+) per verruca, black beneath and frequently surrounded by a whitish border, generally papillate, rarely sunken, sometimes grouped in a central depression, (0.05-)0.2(-1.0) mm wide. Ascomata pertusaroid apothecia (1-)2-4(-7) per wart, (0.30-)0.50(-0.95) mm diam.; hymenium hyaline to white; hypothecium hyaline, rarely pallid; epithecium dark brown or black, K-. Ascus clavate (less often cylindric), (40-)55(-70) x (190-)285(-385) μm. Ascospores (1-)2 per ascus, uniseriate and longitudinal (rarely oblique) in ascus, ellipsoid to less often cylindric, (25-)40(-50) x (70-)125(-190 μm, the wall and lumen K-. Outer spore wall (1-)3(-8) μm thick; inner spore wall (2-)7(-12) μm thick, generally rough (externally or on both sides), finely radially grooved or channelled, and trimmed, the end wall (6-)15(-28) μm thick. Conidiomata not seen.
Substrate and habitat. Corticolous on hardwood trees, rarely on conifers.
Distribution. Eastern North America; in North Carolina found throughout.
Literature
Dibben, M.J. (1980) The Chemosystematics of the Lichen Genus Pertusaria in North America North of Mexico. Publications in Biology and Geology No. 5, Milwaukee Public Museum Press, Milwaukee. 162 pp.
Lamb, I.M. (1954) Lichens of Breton Island, Nova Scotia. Annual Report of the National Museum of Canada132: 239-313 (original description).