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Data Set Maintenance: Data set compiled (Flora of Australia Vol. 55 Lichens-Lecanorales 2, Parmeliaceae). Data set author(s): Nöske, N. M. (04-09-03). Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Xanthoparmelia arapilensis (Elix & P. M. Armstr.) Filson. Xanthoparmelia. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Parmelia arapilensis Elix & P. M. Armstr. Type: Xanthoparmelia arapilensis (Elix & P. M. Armstr.) Filson.

Biogeography: Southern hemispheric. Continent: Australasia. Checklist records: Australia and New Zealand.

Ecology: Biotroph; lichenized; saxicolous (and scattered over pebbles on soil); growing under conditions which are dry.

Thallus: Foliose, subdivided into main parts, irregular, lobed; lobes imbricate (sparingly imbricate or not); branches irregular; applanate (moderately flattened); separate thallus parts 2-5-(8) mm wide. Thallus Size and Differentiation: 6-8 cm in diameter; apex rounded. Upper Surface: Lime green, glossy (shiny) (or dull); maculate (weakly maculate or not); not isidate; not sorediate; not lobulate. Lower Surface: Present; rhizinate; rhizines moderately abundant, brown, not branched (rhizines simple or very rarely sparingly branched).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, soon sessile, 2-5 mm in diam.. Disk: Excavate, brown (dark brown).

Secondary Metabolites: Throughout the thallus medulla, constictic acid, norstictic acid (major), salazinic acid, and usnic acid.

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

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