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Data Set Maintenance: Data set standard item. Data set author(s): Nash T.H. (00-02-07). Data set reviewer(s): Nash T.H.

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

Biogeography: Neotropical; montane and upper montane. Continent: 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, and secondary or without secondary parts, irregular, continuous throughout, lobed; lobes elongate; plane or convex; branches applanate (moderately flattened); bifacial; not segmented; separate thallus parts 1-2-3 mm wide. Thallus Size and Differentiation: 2-4-6 cm in diameter; main branches basally not constricted; apex rounded. Upper Surface: Grey, concave, plane, or convex, glossy (shiny), smooth; not fissurate; not foveate; not convoluted; immaculate; without patches; epruinose; not pseudocyphellate; not wrinkled; eciliate; without hairs; not isidate; without isidiomorphs; not papillate, pustulate, pustules regular; soralia white or pale green, laminal or peripheral, subapical, erupting from pustules, semicapitate, fully excavated or slightly excavated, confluent, but not fusing, soredia farinose; not tuberculate; not lobulate. Lower Surface: Present, black, black in the centre, black along the margin; attached by holdfasts; not cyphellate; not wrinkled; rhizinate; rhizines sparse, extending all across the lower surface, black, branched, dichotomously branched; not tuberculate.

Secondary Metabolites: Present; only in the upper part of the cortex, throughout the cortex, or throughout the thallus medulla, 4,5-di-O-methylhiascic acid, 5-O-methylanziaic acid, atranorin, gyrophoric acid, lecanoric acid, and umbilicaric acid, metabolite(s) of unresolved identity: present.

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

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