Distribution: Washington; Alaska, western and midwestern states, Minnesota, Wisconsin, Illinois, Michigan, northeastern states; British Columbia, Canada east of Canadian Rockies.
Habitat: In full or partial sun.
Substrate: On granitic rocks.
Conservation Status: Not of concern
Thallus areolate, becoming squamulose, yellowish-brown to brownish-red, often shiny. with darker brown, irregular apothecia in the center of each areole.
PNW Herbaria: Specimen records of Acarospora fuscata in the Consortium of Pacific Northwest Herbaria database.
CalPhotos: Acarospora fuscata photos.