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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. (04-11-02). Data set not revised; to be published after submission.

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

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

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

Ecology: Biotroph; lichenized; saxicolous; growing under conditions which are dry (on dry rock surfaces in hinterland areas of south-western W.A., Qld and N.S.W.).

Thallus: Foliose (small-foliose), subdivided into main parts, irregular, lobed (small-foliose); lobes elongate (sublinear-elongate), imbricate; separate thallus parts.2-.8-(1) mm wide. Thallus Size and Differentiation: 5-7 cm in diameter. Upper Surface: Lime green (darkening with age), glossy (shiny) (at least near lobe apices), smooth; immaculate; isidiate (scattered, 0,1-0,3 mm high, isidia apices syncorticate); isidia cylindrical, ramified, coralloid (isidia becoming dense and coralloid in older parts of thallus); not sorediate; lobulate (laciniae often developing in thallus centre, finely branched, subascending, 0,1.0,4 mm wide). Lower Surface: Present, black (shiny); attached by holdfasts (adnate); rhizinate (short); rhizines sparse, black, not branched.

Secondary Metabolites: Present; throughout the thallus medulla, norstictic acid and usnic acid (other secondary metabolites: connorstictic acid).

Spot Tests: Cortex: KC – medulla: K + yellow changing to red, C –, PD + deep yellow (intense yellow).

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