It has dark brown to black apothecia and usually is found on conifer bark.
This species has small tan to yellowish apothecia with greenish yellow thalline margins.
polydactylon group, this taxon has black apothecia, pruinose lobe tips, and an otherwise lustrous upper cortex.
This species seldom produces any apparent thallus and is characterized by black, often angular, apothecia with carbonaceous ridges and irregularities on the surface.
A squamulose terricolous lichen of the western interior United States and adjacent Canada with black marginal apothecia and, typically, with densely pruinose squamules.
This species has a white pruinose thallus and brown apothecia and is usually found on bryophytes on soil in many parts of the USA.
Found on calcareous rocks, this species is also known from North Dakota and Utah and is characterized by a well developed brownish thallus, convex apothecia, and spores lacking endospore thickenings.
This lichen grows under the epidermal cells of smooth, young twigs, giving the apothecia a "pruinose" look.
Thallus smooth, thin, silvery gray, esorediate; photobiont Trentepholia; apothecia substellate to irregular, black, but appearing pruinose due to growth under epidermal cells of twigs; spores hyaline, 1-septate, 2 celled, 20-25 [micro]m long X 10 [micro]m wide; 8 spores per ascus.
Apothecia and thallus K-; apothecial disk a dull waxy yellow with a white pruinose rim Caloplaca ulmorum 2.
Thallus growing on wood or bark, consisting mainly of corticate granules; apothecia rare Candelariella xanthostigma 2.
Apothecia irregular, smooth, rim disappearing with age Lecanora symmicta 3.