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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. (06-04-24). Data set not revised; to be published after submission.

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

Type Information: Basionym: Xanthoparmelia gerhardii Elix & J. Johnst. Type: Xanthoparmelia gerhardii Elix & J. Johnst.; type specimen label data: G. Rambold 5384; holo: M.

Biogeography: Southern hemispheric. Continent: Australasia. Checklist records: Australia (rare, endemic).

Thallus: Foliose (small foliose to subcrustose), isotomic-dichotomous (dichotomously but sparingly branched), lobed; lobes linear (linear-elongate), imbricate (+/- contiguous to widely separate); separate thallus parts.2-.7-(1) mm wide. Thallus Size and Differentiation: 1-3 cm in diameter. Upper Surface: Lime green (darkening to deep olive-brown or blackish in older lobes), matt; immaculate; not isidate; not sorediate. Lower Surface: Present, black in the centre, brown along the margin; attached by holdfasts (tightly adnate); rhizinate (short, rudimentary); rhizines sparse, black.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, soon sessile, abundant, .5-1 mm in diam.. Margin: Crenulate (becoming +/- crenulate, entire, involute), smooth. Disk: Excavate (concave then +/- flat), dark brown (dark brown to black).

Secondary Metabolites: Present; atranorin, constictic acid, norstictic acid (other secondary metabolites: connorstictic acid (+/- trace), +/- cryptostictic acid (trace)), stictic acid, and usnic acid.

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