* Buellia jugorum (Arnold) Arnold (1884: 588) .

Characterized by the thick yellowish, thallus reacting C+ orange (arthothelin chemosyndrome) with a non-amyloid medulla (I-), immersed apothecia with an aethalea - type proper exciple, the aeruginose epihymenium and/or proper exciple (N+ red-violet) and the Buellia- type ascospores, 12.0–15.0 × 7.5–9.0 µm, with rugulate walls. This silicolous species was previously known from montane Europe (Foucard et al. 2002) and from North America [Colorado, New Mexico] (Anderson 1974).

Material examined: ― GUATEMALA. (A) Quezaltenango: S of Quezaltenango, S of Llano del Pinal, N slope of volcano Santa Maria, path among small agriculture fields with small forests, shrubs, trees and outcrops along path, on rock outcrop, 2500 m, 14° 47.1' N, 91° 32.9' W, 23 July 2004, P. & B. van den Boom 32935, 32941 (hb. v.d. Boom) .