Nash, T.H., Ryan, B.D., Gries, C., Bungartz, F., (eds.) 2004. Lichen Flora of the Greater Sonoran Desert Region. Vol 2.
Thallus: fruticose, shrubby to subpendulous, up to 7 cm long branching: simple or sparingly branched, growing from a narrow holdfast branches: solid, flattened, up to 5 mm wide surface: greenish yellow, uneven, without soredia pseudocyphellae: abundant and conspicuous, situated on tip of short coralloid protuberances that are often 2-3 branched near the top cortex: distinct, 25 µm thick; chondroid strands: scattered, smooth Apothecia: common, laminal, stipitate, up to 5(-10) mm in diam. disc: concave, without white margins; margin: concolorous with the thallus, pseudocyphellate asci: elongate-clavate, 8-spored ascospores: hyaline, 1-septate, narrowly fusiform, 14-16 x 3.2-3.5 µm Pycnidia: not observed Spot tests: cortex K-, C-, KC+ yellow, P-; medulla K-, C-, KC-, P- Secondary metabolites: cortex with usnic acid (major); medulla with cryptochlorophaeic acid (major). Substrate and ecology: on twigs World distribution: endemic to Mexico Sonoran distribution: lowland, coastal species of Baja California Sur and Sinaloa. Notes: Ramalina sinaloensis might be confused with R. complanata because both species have similar pseudocyphellae. However, it can be distinguished from the latter by its smooth chondroid strands and its narrowly fusiform ascospores and by the presence of cryptochlorophaeic acid.