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 N slope, rocky gulch. Buckle Point.
-Collection Shaded N slope, rocky gulch, rocky gulch. Buckle Point.