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

Thallus: fruticose, pendulous or decumbent, up to 15 cm long branching: sparingly and dichotomously branched, growing from a narrow holdfast branches: solid, weakly or strongly canaliculate, adjoining branches rarely anastomosed, 1-3 mm wide surface: yellowish green, smooth, shiny, without soredia pseudocyphellae: common, marginal, linear cortex: thin; chondroid strands: continuous or discontinuous, cracked Apothecia: common, stipitate disc: flat to +convex, often with white margin; margin: concolorous with the thallus asci: elongate-clavate, 8spored ascospores: hyaline, broadly fusiform, 15-20 x 5-7 µm Pycnidia: not observed Spot tests: cortex K-, C-, KC+ yellow, P-; medulla K-, C-, KC-, P- Secondary metabolites: cortex with usnic acid; medulla with (Race 1) sekikaic acid (major) and 4'-O-demethylsekikaic acid (minor); (Race 2) divaricatic acid (major) and 4'-O-demethyldivaricatic (minor). Substrate and ecology: on bark World distribution: southern North America and Central America at elevations between 800 to 1200 m Sonoran distribution: only few collections in Sinaloa. Notes: Ramalina subcalicaris is very close to R. alludens that differs in having narrowly fusiform spores instead of broadly fusiform ones in R. subcalicaris.