Baltzo, "Lichens of Mt. Diablo State Park", 1989.
-Collection On seasonally moist, partially shaded rocks in scrub forest of Quercus spp. and Umbellularia on south-facing slopes. South-facing slopes at Mount Diablo Fires Interpretive Trail around summit.
-Collection On moist, diffusely lit bark of Quercus in Quercus woodland with patches of chaparral. Along Back Creek Trail near Clayton.
-Collection Mitchell Canyon, Howe, 1896.
-Collection Mitchell Canyon, Howe, 1896.
-Collection Howe, 1896.
-Collection Over mosses on rocks. Mitchell Canyon, Howe, 1896.