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Data Set Maintenance: Data set standard item. Data set author(s): Nash T.H. Data set reviewer(s): Nash T.H.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Parmotrema. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Biogeography: Northern hemispheric; montane. Continent: Northern America. Checklist records: Mexico, Sonoran Desert, and United States and Canada (continental).

Thallus: Foliose, subdivided into main parts, without secondary parts, sub irregular, continuous throughout, lobed; lobes elongate, horizontal; plane; branches applanate (moderately flattened); bifacial; not segmented; separate thallus parts 10-12-14 mm wide. Thallus Size and Differentiation: 10-15-20 cm long; main branches basally not constricted; apex rounded. Upper Surface: Grey, plane, matt or glossy (shiny), smooth; not foveate; not convoluted; maculate; epruinose; not pseudocyphellate; not wrinkled; ciliate; cilia slender, marginal or in axils; without hairs; not isidate; without isidiomorphs; not papillate, not pustulate; not sorediate; not tuberculate; lobulate. Lower Surface: Present, black, black in the centre, brown along the margin; attached by holdfasts; not cyphellate; not wrinkled; rhizinate; rhizines moderately abundant, with a broad non-rhizinate margin, black, not branched; not tuberculate.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Forming in the thallus centre or all across the thallus surface, moderately abundant, 5-10-15 mm in diam.. Margin: Crenulate, epruinose; not sorediate; not isidiate; without pseudocyphellae pseudocyphellae; not hirsute. Disk: Brown. Hymenium: 35-40-45 µm high.

Ascospores: c. 8 per ascus, broadly ellipsoid, 9-10.5-12 µm long, 6-7.5-9 µm wide.

Secondary Metabolites: Present; only in the upper part of the cortex, throughout the cortex, or throughout the thallus medulla, atranorin, consalazinic acid, or salazinic acid, metabolite(s) of unresolved identity: absent.

Spot Tests: Cortex: KC + deep yellow; medulla: K + yellow changing to red, C –, KC –, PD + red.

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