Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.

Thallus: crustose, endosubstratal or minutely granular surface: whitish gray, dull, esorediate upper cortex: poorly developed, c. 10 µm thick; algal layer and medulla Apothecia: rounded, sessile with a constricted base, 0.2-0.5(-0.65) mm in diam margin: not prominent, soon excluded in old apothecia disc: black, sometimes with a brownish or grayish tinge, dull, epruinose, weakly to strongly convex exciple: hyaline or grayish green near hymenium, laterally 25-30 µm wide, basally 50-65 µm wide, composed of radiating hyphae with lumina 1.5-2(-3) µm wide epihymenium: 5-10 µm high, greenish or grayish black, N+ violaceous, pigmentation coarsely granular or patchy hymenium: hyaline, rarely pale grayish brown, 30-35 µm tall; paraphyses: hyaline, simple, sometimes with grayish green apical cells, lumina 0.7-1 µm, apically 1-2 µm wide; subhymenium: 40-75 µm thick; hypothecium: hyaline, 60-100 µm thck asci: clavate, 8-spored ascospores: hyaline, simple to 1-septate, (7.5)8.6-9.1(-11) x (2-)2.3-2.6(-3) µm Pycnidia: globular, immersed, 40-100 µm in diam. conidia: either bacilliform, 3-6 x 0.5-0.7 µm, or ellipsoid, 2-2.8 x 1-1.5 µm Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: usually on bark of deciduous trees, rarely on conifers in woodlands, the two Sonoran collections are from bark of Abies lasiocarpa World distribution: Europe and North America Sonoran distribution: Arizona, Mt. Baldy Wilderness, at c. 3150 m. Notes: Biatora globulosa is easily mistaken for a Micarea in the field, on account of the small, strongly convex apothecia. The similar Bacidia beckhausii has 3(-7)-septate spores 16-32 µm long.