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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: accepted. Taxonomic rank: species. Currently accepted name Xanthoparmelia erosa (Elix & P. M. Armstr.) Elix & J. Johnst. Xanthoparmelia. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Parmelia erosa Elix & P. M. Armstr. Type: Xanthoparmelia erosa (Elix & P. M. Armstr.) Elix & J. Johnst.

Biogeography: Southern hemispheric (endemic, very rare). Continent: Australasia. Checklist records: Australia (Eyre Peninsula, Gawler Ra. (S.A.)).

Ecology: Biotroph; lichenized; terricolous; growing under conditions which are dry (in subarid shrubland).

Thallus: Foliose, subdivided into main (strongly convolute, contorted) parts, isotomic-dichotomous (sparsely dichotomously branched), lobed; lobes elongate or linear (sublinear); branches applanate (moderately flattened); separate thallus parts 3.5-8 mm wide. Thallus Size and Differentiation: 2-5 cm in diameter. Upper Surface: Lime green (pale yellow-green, darkening in older central lobes), glossy (shiny), rough (rugulose and cracked); fissurate; immaculate; not isidate; sorediate; soralia laminal, forming ab initio, soredia coarse. Lower Surface: Present, brown (pale brown to dark brown); not attached, thallus vagrant; rhizinate; rhizines sparse (very sparse), brown (concolorous with lower surface), not branched.

Secondary Metabolites: Present; throughout the thallus medulla, consalazinic acid, salazinic acid, and usnic acid.

Spot Tests: Cortex: KC – medulla: K + yellow changing to red, C –, PD + orange.

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