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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 imbricatula; Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Biogeography: Pantropical and neotropical; submontane, montane, and upper montane. Continent: Australasia, Northern America, Southern America, and Asia-Tropical. Checklist records: Australia, Bolivia, Ecuador, Mexico, Peru, Sonoran Desert, and United States and Canada (continental).

Thallus: Foliose, subdivided into main parts, isotomic-dichotomous, dispersed throughout and distinctly seperate, lobed; lobes sub linear, horizontal; plane or subconvex; branches bifacial; not segmented; separate thallus parts 1-2.5-4 mm wide. Thallus Size and Differentiation: 3-5 cm long; main branches basally not constricted; apex curved downwards; rounded. Upper Surface: Grey, plane, matt or glossy (shiny), smooth; not fissurate; not foveate; not convoluted; maculate; without patches; epruinose or pruinose; not pseudocyphellate; not wrinkled; eciliate; without hairs; isidiate; isidia central or laminal, cylindrical, ramified, coralloid; 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, 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, 5-10-15 mm in diam.. Margin: Crenulate, epruinose; not sorediate; not isidiate; without pseudocyphellae pseudocyphellae; not ciliate; not hirsute. Disk: Brown.

Secondary Metabolites: Present; throughout the cortex or throughout the thallus medulla, 4-O-demethylbarbatic acid, atranorin, barbatic acid, isoobtusatic acid, norobtusatic acid, or obtusatic acid.

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

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