thallus gray, shiny, areolate to subsquamulose, growing on thallus of host or spilling over onto rock; cortex K+y slow but strong C- KC- P+y slow UV-; medulla K- C- KC- P- to P+y strong in places UV-; apothecia black, epruinose to strongly pruinose; rims thalline to black or excluded, smooth, even to slightly prominent when thalline; epihymenium dark black-green, turning greener in K, POL+ clearing in K; amphithecium POL+ clearing somewhat but coarse crystals persisting in K; spores 8 per ascus, ellipsoid, ~11-13x6-8um; TLC atranorin + psoromic + zeorin (JPH plate 59.05 solvent C on 20180709)