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DescriptionThallus: fruticose, shrubby to subpendulous, up to 10 cm long; branching: moderately branched, growing from a narrow holdfast; branches: solid, flat to weakly canaliculate, 4-7(-15) mm wide; surface: ocher yellow or yellowish green, surface rugose towards the tips, longitudinal ridges of chondroid strands or striations common, without soredia; pseudocyphellae: various from subrotund, elliptical or short linear, slightly depressed, abundant on lower side of branches; cortex: distinct, 15-20 µm thick; chondroid strands: continuous or discontinuous especially in aged branches, smooth to weakly cracked; Apothecia: common, laminal, or subterminal, entire or radially split; disc: concave, without white margins; margin: concolorous with the thallus, reticulately ridged, often pseudocyphellate; asci: elongate-clavate, 8-spored; ascospores: hyaline, 1septate, broadly fusiform, 11-14 x 3.5-4 µm; Pycnidia: common, laminal, with pale ostioles, mixed with tubercles; conidia: rod-shaped, 3-4 x 0.5 µm; Spot tests: cortex K-, C-, KC+ yellow, P-; medulla K-, C-, KC-, P-; Secondary metabolites: cortex with usnic acid (major); medulla with divaricatic acid (major) and salazinic acid (±trace).; Substrate and ecology: on twigs; World distribution: endemic to Mexico; Sonoran distribution: Baja California, Baja California Sur, Sonora and Sinaloa.; Notes: Ramalina sonorensis might be confused with R. bajacalifornica, that differs in having narrowly fusiform ascospores and by producing only salazinic acid. It resembles R. complanata, a species widely distributed in Central and South America, from which it can be distinguished by having elliptic or short linear pseudocyphellae.