Hey crustose people, I need some help with a small crustose on rock. It came from south central Oregon. Spot tests are negative except the exciple is I+B. Spores are globose with a halo. Size range from 8.0 to 12.8µ. Apothecia range from .05 to 2mm. There are 3 photos in the gallery marked Abert Rim lichen.
Thanks for the help,
Steve