IUCN threat status:

Not evaluated

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Description

 Thallus: fruticose, pendulous or decumbent, up to 20(30) cm long; branching: sparingly and dichotomously branched, growing from a narrow holdfast; branches: solid, weakly or strongly canaliculate, adjoining branches often anastomosed, 1-3 mm wide; surface: yellowish green, smooth, shiny, often with isidia-like swellings along the edge of branches, without soredia; pseudocyphellae: common, mostly marginal or rarely laminal, linear; cortex: thin; chondroid strands: continuous, heavily cracked; Apothecia: common, stipitate; disc: flat to +concave, without white margin; margin: concolorous with the thallus; asci: elongate-clavate, 8-spored; ascospores: hyaline, 1-septate, narrowly fusiform, 22-32 x 3.5-4 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 sekikaic acid (major) and 4'-O-demethylsekikaic acid (minor).; Substrate and ecology: on bark; World distribution:: southern North America and Central America; Sonoran distribution: Sinaloa, more common in southern states of Mexico at elevations between 800 to 1200 m.; Notes: Ramalina alludens is characterized by canaliculate branches without soredia, marginal continuous pseudocyphellae, heavily cracked chondroid strands in the branches, narrowly fusiform ascospores and by the presence of depsides such as divaricatic acid or sekikaic acid as major chemical metabolites in the medulla. Two chemical races of R. alludens, Race 1 (sekikaic acid containing race) and Race 2 (divaricatic acid containing race) are found in the Sonoran area. Differences between R. canalicularis and R. subcalicalis are given under those species. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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