Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.
Thallus: crustose, thin, areoles scattered or contiguous, up to 0.4-0.6 mm wide, plane to slightly convex, or forming a continuous crust over bryophytes surface: light to dark gray, often with a bluish or brownish tinge, dull; margin: indeterminate; prothallus: lacking; areoles rapidly becoming sorediate soredia: usually bluish or greenish gray, lighter than thallus, in discrete soralia the same size as areoles Apothecia: not reported from North America, elsewhere, rare, sessile, 0.3-0.4 mm in diam. disc: usually poriform thalline margin: prominent, sometimes sorediate asci: clavate, 8-spored ascospores: brown, 1-septate, ellipsoid, type A development, Pachysporaria-type, (18-)20.5-23.5(26) x (9.5-)11-13(-15) µm Pycnidia: not seen Spot tests: thallus and soralia K+ yellow, C-, KC-, P+ faint yellow Secondary metabolites: atranorin and zeorin. Substrate and ecology: on bark and mosses, collected on Acer sp., Baccharis pilularis, and Quercus garryana, in humid habitats World distribution: southwestern Norway, British Isles, central Europe and oceanic western North America Sonoran distribution: known only from San Miguel Island, Santa Barbara County, California, its southernmost North American locality. Notes: Rinodina griseosoralifera is characterized by its discrete blue-gray soralia, and presence of atranorin and zeorin. It is unlikely to be confused with other Rinodina species possessing vegetative propagules in the study area. One of a number of vegetatively reproducing species with transatlantic disjunct distributions discussed by Sheard (1995) and now shown to have a wider latitudinal distribution in western North America.