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

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Xanthoparmelia succedans Elix & J. Johnst. Xanthoparmelia. Synonyms: Parmelia adpressa Kremp.
nom. illeg. non Parmelia appressa Spreng.
(Parmelia plittii auct. non Gyeln. = Xanthoparmelia plittii (Gyeln.) Hale); Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Xanthoparmelia succedans Elix & J. Johnst. Type: Parmelia adpressa Kremp.; type specimen label data: A. Glaziou 3842; holo: M.

Biogeography: Southern hemispheric; coastal. Continent: Australasia and Southern America (Brazil). Checklist records: Australia (very rare, in southern Australia (W.A. and N.S.W.)).

Ecology: Lichenized; saxicolous; growing under conditions which are dry (subarid areas).

Thallus: Foliose, irregular, lobed (centrally lobate); lobes elongate, imbricate (seperate or barely imbricate); plane; separate thallus parts 2-2.5-(3) mm wide. Thallus Size and Differentiation: Up to 10 cm in diameter. Upper Surface: Lime green (darkening to olive-green or blackish; lobe margins black near apices), glossy (shiny) (towards apices), smooth; immaculate; wrinkled (rugulose); isidiate (sparse to moderately dense, slender; isidia apices syncorticate and intact); isidia central (often covering thallus centre), cylindrical, not ramified or ramified (becoming extensively branched); not sorediate. Lower Surface: Present, brown (pale tan to brown); attached by holdfasts (moderately to tightly adnate); rhizinate; rhizines moderately abundant, black or brown (concolorous with lower surface), not branched (+/- tufted or not).

Reproduction Strategy: With sexual (and possible asexual) stages (but rare). Ascocarps: Apothecioid, soon sessile, 2-4 mm in diam.. Margin: Distinct (involute, becoming undulating); isidiate. Disk: Excavate to plane, dark brown.

Secondary Metabolites: Present; constictic acid, norstictic acid, salazinic acid, stictic acid (stictic acid (major) and cryptostictic acid (trace)), and usnic acid.

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

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