Grimmia laevigata (Brid.) Brid.
Annotated by John A. Christy, Jun 1980.

Oregon: Jackson County: Large rhyolite outcrop, E side of Elk Creek, just E of proposed dam site, proposed Elk Creek Reservoir, 8 km NE of Trail. Elev. 549 m.
42.682033° N, 122.729254° W; T33S, R01E, SE4 SW4 Sec. 20.
Datum: WGS 84. Uncertainty: 268 meters. Coordinate Source: Digital Map.
Forming pure mats over more or less vertical rock sheet, shelf of rock on both sides of cave-like depression. Full S exposure. With Pseudobraunia, Xanthoparmelia, Rhizocarpon geographicum, Diploschistes, Racomitrium elongatum, Racomitrium heterostichum, Selaginella wallacei.

John A. Christy 1807, May 8, 1980
HPSU, Accession: 22614