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Data Set Maintenance: Data set compiled (Flora of Australia Vol. 55 Lichens-Lecanorales, Parmeliaceae). Data set author(s): Nöske, N. M. @EXCL@ Bungartz F. (06-05-17). Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Xanthoparmelia nashii Elix & J. Johnst. Xanthoparmelia. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Xanthoparmelia nashii Elix & J. Johnst. Type: Xanthoparmelia nashii Elix & J. Johnst.; type specimen label data: T. H. Nash 20392; holo: ASU.

Biogeography: Northern hemispheric (Southern hemispheric). Continent: Australasia. Checklist records: Australia (very rare, endemic, south-western W.A.).

Thallus: Foliose, irregular, lobed; lobes elongate or linear (sublinear), imbricate (or not); separate thallus parts 1-2-(3) mm wide. Thallus Size and Differentiation: 5-6 cm in diameter. Upper Surface: Lime green (darkening, lobe margins often blackened, particularly towards apices), plane or concave (slightly concave), glossy (shiny) (at least near lobe apices), smooth; immaculate; isidiate (dense, apices syncorticate and intact); isidia cylindrical, not ramified or ramified (occasionally becoming branched), sparse; not sorediate; lobulate (occasionally narrower laciniae overlie thallus centre). Lower Surface: Present, black (dull, smooth, flat); attached by holdfasts (adnate); rhizinate (slender, 0.3-0.5 mm long); rhizines sparse or moderately abundant, black, not branched.

Reproduction Strategy: Only known as sterile, asexually reproducing form (not seen).

Secondary Metabolites: Present; 4-O-demethylbarbatic acid, barbatic acid, diffractaic acid (diffractaic acid (major), other secondary metabolite: 3-alpha-hydroxybarbatic acid (trace)), and usnic acid.

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