THALLUS: thick, ashy-gray, shiny
APOTHECIA: lecanorine, rough-walled, disc heavily pruinose
SPORES: 8 per ascus in a single row, 9-28 × 5-18 µm
CHEMISTRY: cortex and disc PD+ red (fumarprotocetraric and succinoprotocetraric acids)
North America, east and west coast and inland temperate rainforest.
Common Name: Frosted Wart Lichen
Gray shiny crust lichen with thick, rough, concentric-walled, heavily-pruinose apothecia, on conifer bark.
Bark of mostly of conifers.
According to Brodo, this is the only disc-bearing Pertusaria with heavily pruinose discs and ragged concentric rims.
