U.S.A., Pennsylvania, Bucks, along a small tributary to Tohickon Creek, east of Tohickon Creek, north of parking area at terminus of Camp Trail Road, north of PA Route #536, ca. 4 miles southeast of Quackertown, Nockamixon State Park.
40.441667 -75.265833
40° 26' 30" N, 75° 15' 57" W; UTM Zone 18, 477464E, 4476805N
152-168 meters
500-550 ft.
On a dead tree, in a mixed hardwood forest of Acer, Quercus, Nyssa, and Fraxinus with abundant diabase boulders. Assoc. spp: Anaptychia palmulata, Phaeophyscia spp., Lepraria lobificans, Collema subflaccidum.
Thallus corticolous, foliose, gray-blue, pustulose; underside black with brown margins; pustules laminal, abundant; medulla yellowish. Substrate: Corticolous.