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 Thallus: foliose, medium to large, 5-15 cm in diam., adnate; lobes: +flattened and elongate (1-2 cm wide and up to 5 cm long), imbricate or separate; tips: rounded to subtruncate, often ascending and undulate; upper surface: gray or blue-gray to brown when dry, blackish green when wet, smooth, shiny, rarely pruinose marginally, without isidia, schizidiate marginally; medulla: white, with thick, +loosely interwoven hyphae; photobiont: Nostoc; lower surface: white, abruptly darkening, veinless, with small whitish spots, rhizinate; rhizines: fasciculate, blunt, c. 3 mm long; Apothecia: not seen in Sonoran material, elsewhere +round, on short lobes, up to 9 mm in diam.; margin: smooth to crenulate; disc: flat, dark brown, smooth; ascospores: colorless to pale brown, acicular, 3(-5)-septate, 27-40 x 4-6 µm; Pycnidia: not seen in Sonoran material; Spot tests: all negative; Secondary metabolites: tenuiorin, methyl gyrophate, gyrophoric acid, hopane-6α,22-diol and unidentified terpenoids.; Substrate and ecology: among mosses over soil; World distribution: temperate and boreal regions of North America, Europe and Asia; Sonoran distribution: Arizona (2100-3140 m) and Baja California.; Notes: Thick, glossy and schizidiate thalli and a veinless lower surface are the main characters of P. elisabethae and distinguish it from its closest ally P. horizontalis. 

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© Lichen Unlimited: Arizona State University, Tempe.

Source: Lichen Flora of the Greater Sonoran Desert Region

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