Arthonia caerulescens (Almq.) R. Sant.
Annotated by Mike Haldeman, 19 Dec 2019. Remarks: Around the Melanohalea are Lecanora laxa apothecia (amphithecial cortex expanded to 64 microns at base, distinct). On L. laxa apothecia are apothecia of Arthonia caerulescens (epithecium blackish-olive, K+more olive; spores hyaline, 1-septate, 1 cell wider, the other longer, 6 ave. 11.2x3.8 microns; hypothecium reddish-brown, K+olive-black)

Oregon: Crook County: Elev. 5500 ft.
44.052096° N, 120.234048° W
Uncertainty: 400 meters. Coordinate Source: USFS plot database. Coordinates displaced by < 400 meters for confidentiality. Elevation displaced by < 100 ft.

C.Coon s.n., Jul 16, 2001
OSC, Barcode: OSC-M-206303