Bruce McCune wrote:
You expressed uncertainty about the C reaction, so I suggest getting the full suite of spot tests and UV, then going from there. The whole thallus photo looks like a Pertusaria species but the closeup of the apothecium looks like a different species of Pertusaria. Hard to tell from photos.
Thank you for the help! Working through the key again I've settled on P. borealis.
I noticed a note after the PEBO entry I didn't see before that helped me come to this conclusion. Tonsberg noted a fertile specimen of this species that have 6 small spores/ascus. This, along with the chemistry, matches my specimen.