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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. (04-10-18). Data set not revised; to be published after submission.

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

Type Information: Basionym: Parmelia congesta Kurok. & Filson. Type: Xanthoparmelia congesta (Kurok. & Filson) Elix & J. Johnst.

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

Ecology: Biotroph; lichenized; saxicolous; growing sun-exposed, under conditions which are dry.

Thallus: Foliose, subdivided into main parts, irregular, lobed; lobes imbricate; branches irregular; applanate (moderately flattened); separate thallus parts.7-3-(7) mm wide. Thallus Size and Differentiation: 7-10 cm in diameter; main branches basally not constricted. Upper Surface: Yellow (yellow to yellow-green), matt or glossy (shiny) (slightly glossy), rough (becoming rugose and ridged in older, central part of thallus); immaculate; not isidate; not sorediate. Lower Surface: Present (rugulose or not), black; attached by holdfasts (adnate); rhizinate (robust, 0,2 mm long); rhizines sparse, black, not branched.

Reproduction Strategy: With sexual (and possible asexual) stages (subpedicellate). Ascocarps: Apothecioid, 3-9 mm in diam.. Margin: Distinct or indistinct (involute and undulating, ultimately developing subradiating fissures). Disk: Excavate, brownish red (red-brown to black-brown).

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

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

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