Physcia stellaris is a species of lichen. It is pale grey, but darker in the centre, and lacks isidia, lobules, soredia and pruina. It tests negative with potassium hydroxide.
Baltzo, "Lichens of Mt. Diablo State Park", 1989.
-CollectionOn moist, diffusely lit twigs of Quercus in open Quercus douglasii and Pinus coulteri forest with Adenostoma chaparral along Eagle Peak trail near Mitchell Rock.
-Collection On Quercus Bark, rock outcrops with Quercus, Pinus sabiniana. Mount Diablo summit, North side.