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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 rockii Zahlbr.; Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Biogeography: Neotropical; montane and upper montane. Continent: Northern America and Southern America. Checklist records: Bolivia, Ecuador, Mexico, Peru, Sonoran Desert, and Venezuela.

Ecology: Biotroph; lichenized; corticolous. Host or Phorophyte Taxonomy: Pinus ponderosa (common on pines).

Thallus: Foliose, subdivided into main parts, and secondary or without secondary parts, isotomic-dichotomous, continuous throughout, lobed; lobes elongate, horizontal; plane; branches applanate (moderately flattened); bifacial; not segmented; separate thallus parts 1.5-2.5-4 mm wide. Thallus Size and Differentiation: 2-5-8 cm in diameter; main branches basally not constricted; apex rounded. Upper Surface: Grey, concave or plane, matt, smooth; not fissurate; not foveate; not convoluted; maculate; without patches; pruinose, pruina scarce; not pseudocyphellate; not wrinkled; eciliate; without hairs; not isidate; without isidiomorphs; not papillate, pustulate, pustules regular; sorediate; soralia white, laminal, forming ab initio or erupting from pustules, erose, fully excavated or slightly excavated, sometimes confluent, but not fusing, soredia farinose; not tuberculate; not lobulate. Lower Surface: Present, black, black in the centre; attached by holdfasts; not cyphellate; not wrinkled; rhizinate; rhizines sparse, extending all across the lower surface, 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, 1-3-5 mm in diam.. Margin: Crenulate, epruinose; sometimes sorediate; not isidiate; without pseudocyphellae pseudocyphellae; not ciliate; not hirsute. Disk: Brown.

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

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

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