Distribution: East of Cascades crest in Washington; eastern Oregon, northeastern California, Idaho, Montana, Wyoming, Colorado, Utah, New Mexico; British Columbia.
Habitat: Arctic/alpine.
Substrate: Parasitic on a variety of arctic/alpine lichens growing on siliceous rock.
Conservation Status: Not of concern
Thallus within the host; Apothecia clustered, rusty red-orange, with dark orange to black margins
PNW Herbaria: Specimen records of Caloplaca epithallina in the Consortium of Pacific Northwest Herbaria database
CalPhotos: Caloplaca epithallina photos