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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@ Bungartz F. (06-05-11). Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Xanthoparmelia isidiigera (Müll. Arg.) Elix & J. Johnst. Xanthoparmelia. Synonyms: Parmelia conspersa var. laxa f. isidiigera Müll. Arg.
Parmelia isidiigera (Müll. Arg.) Gyeln.
nom. illeg. non Parmelia isidiigera (Müll. Arg.) Vain.; Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Biogeography: Southern hemispheric. Continent: Australasia and Pacific (occurs also in Papua New Guinea). Checklist records: Australia (common and widespread in Australia, occurs in all States and Territories) and New Zealand.

Thallus: Foliose, irregular, lobed; lobes imbricate (or not); plane or convex (slightly convex); separate thallus parts 1-2-(5) mm wide. Thallus Size and Differentiation: 6-10 cm in diameter. Upper Surface: Lime green (becoming blackish green in thallus centre), glossy (shiny) (at least near lobe apices); immaculate; isidiate or not isidate (scattered, short, commonly very slender (0.04-0.08 mm wide), apices syncorticate and intact); isidia globular (subglobose) or cylindrical, not ramified or ramified (sparingly branched); not sorediate; lobulate (occasionally with narrower laciniae overlying thallus centre). Lower Surface: Present, black (shiny black); attached by holdfasts (adnate); rhizinate (short); rhizines sparse or moderately abundant, black, not branched.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, soon sessile, up to 6 mm in diam.. Margin: Distinct (thick and involute, becoming undulating); isidiate. Disk: Excavate (then undulate-distorted), brown or dark brown.

Secondary Metabolites: Present; consalazinic acid, salazinic acid (major), and usnic acid.

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

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