Buellia oidalea is a species of crustose lichen[1][2] found along the Pacific coast of North America, from Coos County, Oregon to Baja California Sur.

[3][4] The ascospores of Buellia oidalea typically exhibit a hyaline to ±olive coloration, eventually transitioning to brown, while often retaining unpigmented apices.

[3] Buellia oidalea thrives on the bark and wood surfaces of trunks, branches, and twigs found on both broad-leaved and coniferous trees and shrubs.

Its habitat encompasses various open environments along the Pacific coast, including dune areas, salt marshes, chaparral, and coastal deserts.

[3] This species is predominantly found along the Pacific coast and islands of North America, spanning from Coos County, Oregon to Baja California Sur.

While resembling Buellia oidaliella, it sets itself apart with notably larger spores featuring thickened, frequently unpigmented apices, along with a taller hymenium, and the lack of calcium oxalate.