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DescriptionThallus: fruticose, shrubby or tufted, up to 7(-15) cm long; branching: irregularly or dichotomously branched from a narrow holdfast; branches: solid, irregular in thickness or plane, 1-3(-5) mm wide; surface: greenish gray to greenish yellow, smooth, shiny, sorediate; soredia: farinose, in laminal or marginal, rounded, discrete soralia; pseudocyphellae: almost lacking in distal branches, more common near the base of branches, ellipsoid to short linear; cortex: thin; chondroid strands: continuous, weakly to heavily cracked; Apothecia: rare but frequent in local populations in some limited areas, mostly laminal, up to 6 mm in diam.; disc: covered with thin pruina; margin: concolorous with the thallus, entire, usually lacking pseudocyphellae; asci: elongate-clavate, 8-spored; ascospores: hyaline, 1-septate, broadly fusiform, 12-15 x 5-7 µm; Pycnidia: not observed; Spot tests: cortex K-, C-, KC+ yellow, P-; medulla K+ yellow or yellow turning dark red, C-, KC-, P+ yellowish orange; Secondary metabolites: cortex with usnic acid; medulla with (race 1) protocetraric acid (major); (race 2) norstictic (major) acid and salazinic acid (±trace).; Substrate and ecology: on bark, rarely on rock; World distribution: cosmopolitan, especially common in temperate, coastal regions; Sonoran distribution: southern California, Baja California and Baja California Sur.; Notes: Among the two chemical races of Ramalina farinacea, race 1 (protocetraric acid) is more common in the greater Sonoran region. The distribution of the chemical races in North America have been extensively investigated by Bowler (1977).