U.S.A., Montana, Glacier, Glacier National Park. around the perimeter of Lost Lake, approximately 10 miles SW of St. Mary, Montana on the Going-to-the-Sun Road.
1463 meters
4800 ft.
With Leptogium saturninum.
K+ pale yellow; spores brown; 1-septate; 18 x 8.5µm. Common. On bark of cottonwoods