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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. (06-06-01). Data set not revised; to be published after submission.

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

Type Information: Basionym: Xanthoparmelia stuartensis Elix & J. Johnst. Type: Xanthoparmelia stuartensis Elix & J. Johnst.; type specimen label data: J. A. Elix 21227 & H. Streimann; holo: CBG.

Biogeography: Southern hemispheric. Continent: Australasia. Checklist records: Australia (rare, only known from the type locality).

Thallus: Foliose, irregular, lobed; lobes imbricate (or not); separate thallus parts 1-3 mm wide. Thallus Size and Differentiation: Up to 6 cm in diameter. Upper Surface: Lime green (margins often black), glossy (shiny); immaculate; isidiate (numerous, wart like, small (to 0.3 mm high); isidia apices syncorticate and entire); isidia laminal, globular or cylindrical (shortly cylindrical); not sorediate. Lower Surface: Present, brown or dark brown (with lobe apices black-brown); attached by holdfasts; rhizinate (short); rhizines sparse or moderately abundant, brown or dark brown (concolorous with lower surface), not branched.

Reproduction Strategy: With sexual (and possible asexual) stages (but rare, subpedicellate). Ascocarps: Apothecioid, up to 4 mm in diam.. Margin: Persistent (involute at first, entire); isidiate (densely isidiate). Disk: Strongly convex, brown or pale brown.

Secondary Metabolites: Present; protocetraric acid (major), usnic acid, and virensic acid.

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

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