Apothecial section; Habitat: Artemisia frigida - Stipa comata on calcareous silts; Location: Lake Missoula sediments along US Highway 93, 7 km S of Ravalli; Substrate: Soil; Elevation: 900 meters.
Exciple; Habitat: Artemisia frigida - Stipa comata on calcareous silts; Location: Lake Missoula sediments along US Highway 93, 7 km S of Ravalli; Substrate: Soil; Elevation: 900 meters.
Thallus; Habitat: Artemisia frigida - Stipa comata on calcareous silts; Location: Lake Missoula sediments along US Highway 93, 7 km S of Ravalli; Substrate: Soil; Elevation: 900 meters.
Apothecia; Habitat: Artemisia frigida - Stipa comata on calcareous silts; Location: Lake Missoula sediments along US Highway 93, 7 km S of Ravalli; Substrate: Soil; Elevation: 900 meters.
Habit; Habitat: Artemisia frigida - Stipa comata on calcareous silts; Location: Lake Missoula sediments along US Highway 93, 7 km S of Ravalli; Substrate: Soil; Elevation: 900 meters.
Habit; Location: Cliffs on south slope above Goat Creek, T23N R16W S6; Substrate: Rock, calcareous outcrop; Elevation: 1524 meters; Notes: Caloplaca pusilla det. E. Gaya 2011.
Habit; Location: Cliffs on south slope above Goat Creek, T23N R16W S6; Substrate: Rock, calcareous outcrop; Elevation: 1524 meters; Notes: Caloplaca pusilla det. E. Gaya 2011.