Thelotrema subtile Tuck.
Annotated by G. Y. McHenry.

Washington: Whatcom County: Sulphur Creek Lava Flow, 2.6 miles northwest of junction of South Fork of the Nooksack Road (United States Forest Service Road 3725) and Baker Lake Road 13 miles north of Concrete. Elev. 1700 ft.
48.677181° N, 121.745487° W,
Datum: WGS 84. Uncertainty: 2293 meters. Coordinate Source: Digital Map.

G. Y. McHenry 51787.93, May 17, 1987
WTU, Barcode: WTU-L-022276