THALLUS: creamy white, rough to verrucose
APOTHECIA: up to 4 mm, double-margins (thalline outer and disc-colored inner),
disc pinkish, epruinose, no algae or algae spotty below apothecium
SPORES: ???
CHEMISTRY: thallus and rims C+ and KC+ red (gyrophoric acid), medulla C-
Common Name: Double-Rimmed Saucer Lichen
Rough whitish crustose lichen with large thick-rimmed pinkish apothecia on conifer bark.
Conifer bark and wood, particularly Pseudotsuga menziesii.
O. subpallescens is very similar but lacks the inner excipular ring, and has a continuous algal layer below the apothecium.
