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Data Set Maintenance: Data set standard item. Data set author(s): Nash T.H. (00-02-04). Data set reviewer(s): Nash T.H.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Hypotrachyna. Synonyms: Parmelia laevigata (Smith) Ach.; Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Biogeography: Neotropical; submontane, montane, and upper montane. Continent: Europe, Northern America, and Southern America. Checklist records: Bolivia, Ecuador, Mexico, Sonoran Desert, United States and Canada (continental), and Venezuela.

Thallus: Foliose, subdivided into main parts, without secondary parts, isotomic-dichotomous, continuous throughout, lobed; lobes sub linear, horizontal; plane or subconvex; branches applanate (moderately flattened); bifacial; not segmented. Thallus Size and Differentiation: 1.5-3-4.5 cm in diameter; main branches basally not constricted; apex rounded. Upper Surface: Grey, subconcave, plane, or subconvex, matt, smooth; not fissurate; not foveate; not convoluted; maculate; pruinose, pruina scarce; not pseudocyphellate; not wrinkled; eciliate; without hairs; not isidate; without isidiomorphs; not papillate, sometimes pustulate, pustules regular; not sorediate; soralia broad, white, laminal, erupting from pustules, capitate, erose, fully excavated or slightly excavated, isolated, not confluent with other soralia, soredia farinose; not tuberculate; not lobulate. Lower Surface: Present, black, black in the centre, dark brown along the margin; attached by holdfasts; not cyphellate; not wrinkled; rhizinate; rhizines sparse, with a narrow non-rhizinate margin, black, branched, dichotomously branched; not tuberculate.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, forming all across the thallus surface, all across the surface, sparse. Margin: Crenulate, epruinose; not sorediate; not isidiate; without pseudocyphellae pseudocyphellae; not ciliate; hirsute. Disk: Brown.

Secondary Metabolites: Present; throughout the cortex or throughout the thallus medulla, 4-O-demethylbarbatic acid, atranorin, barbatic acid, echinocarpic acid, or norobtusatic acid, metabolite(s) of unresolved identity: present.

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

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