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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: basionymous or accepted. Taxonomic rank: species. Hypotrachyna. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Biogeography: Neotropical; submontane and montane. Continent: Northern America and Southern America. Checklist records: Sonoran Desert and Venezuela.

Thallus: Foliose, subdivided into main parts, isotomic-dichotomous, continuous throughout, lobed; lobes elongate, horizontal; plane or convex; branches applanate (moderately flattened); bifacial; not segmented; separate thallus parts.5-1.2-2 mm wide. Thallus Size and Differentiation: 4-6-8 cm in diameter; main branches basally not constricted; apex rounded. Upper Surface: Grey, plane, glossy (shiny), smooth; not fissurate; not foveate; not convoluted; immaculate; epruinose; not pseudocyphellate; not wrinkled; eciliate; without hairs; not isidate; without isidiomorphs; not papillate, not pustulate; not sorediate; 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, black, branched, dichotomously branched; not tuberculate.

Reproduction Strategy: Usually with sexual (and possible asexual) stages. Ascocarps: Apothecioid, forming all across the thallus surface, all across the surface, moderately abundant. Margin: Crenulate, epruinose; not sorediate; not isidiate; without pseudocyphellae pseudocyphellae; not ciliate; not hirsute. Disk: Dark brown.

Secondary Metabolites: Present; only in the upper part of the cortex, throughout the cortex, or throughout the thallus medulla, a-collatolic acid, alectoronic acid, atranorin, or ß-alectoronic acid, metabolite(s) of unresolved identity: absent.

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