Buellia densipruinosa from the Himalayan moist temperate forest in Pakistan is described as new to science. nrITS sequences confirm its position within the genus Buellia and, together with its morphology and chemistry, suggest its distinction from other species of this genus. The taxon is characterized by a gray to grayish black thallus, plane to slightly concave apothecia, 1.5–3 mm wide with a pruinose disc, a hymenium 90–150 μm high, 1-septate ascospores, 7.3‒12 × 3‒4.5 μm, and by presence of 2'-O-methylperlatolic acid and atranorin as the major substances. Keywords: Lichen diversity, lichenized fungi, phylogenetic studies.