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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@ Clerc, P. (04-10-02). Data set not revised; to be published after submission.

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

Type Information: Basionym: Xanthoparmelia blackdownensis Elix & J. Johnst. Type: Xanthoparmelia blackdownensis Elix & J. Johnst.

Biogeography: Southern hemispheric (endemic). Continent: Australasia. Checklist records: Australia.

Thallus: Foliose, subdivided into main parts, irregular, dispersed throughout and distinctly seperate (mostly widely separate), lobed; lobes elongate (subirregular to sublinear-elongate), imbricate (barely imbricate or not); separate thallus parts.5-1 mm wide. Thallus Size and Differentiation: 1-2 cm in diameter. Upper Surface: Lime green, glossy (shiny) (at least near lobe apices), smooth; immaculate; isidiate; isidia central, cylindrical, not ramified; not sorediate. Lower Surface: Present, brown (pale tan to light brown, lobe apices darker and shiny); rhizinate (short); rhizines sparse or moderately abundant, brown (concolorous with lower surface), not branched.

Secondary Metabolites: Present; diffractaic acid and usnic acid (4-Odemethylbarbatic acid (minor) and 2-?-hydroxybarbatic acid (trace)).

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