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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. (06-05-14). Data set not revised; to be published after submission.

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

Type Information: Basionym: Xanthoparmelia louisii Elix & J. Johnst. Type: Xanthoparmelia louisii Elix & J. Johnst.; type specimen label data: J. A. Elix 10661 & L. H. Elix; holo: CBG.

Biogeography: Southern hemispheric. Continent: Australasia. Checklist records: Australia (rarely collected but possibly overlooked, endemic, south-western W.A.).

Thallus: Foliose (small foliose to subcrustose), isotomic-dichotomous (dichotomously branched), lobed; lobes linear (sublinear); plane; separate thallus parts.2-.8-(1) mm wide. Thallus Size and Differentiation: 2-4 cm in diameter. Upper Surface: Yellow or lime green (darkening to deep olive-brown or blackish in older lobes), matt; fissurate (cracks in older lobes and often forming areolae 0.2-0.5 mm wide in thallus centre); fissures transversely oriented oriented; immaculate; not isidate; not sorediate. Lower Surface: Present, black, brown, or dark brown; attached by holdfasts (very tightly adnate); rhizinate (or else part of lower surface adhering directly to the substratum); rhizines abundant, black, not branched.

Reproduction Strategy: With sexual (and possible asexual) stages (common). Ascocarps: Apothecioid, soon sessile (subpedicellate to sessile), .5-1 mm in diam.. Margin: Crenulate (+/- crenulate), smooth, indistinct (narrow, entire). Disk: Excavate, black.

Conidia: Bacilliform or bifusiform (subbifusiform); 7-8 µm long; .5 µm wide.

Secondary Metabolites: Present; 4-O-demethylbarbatic acid, barbatic acid, squamatic acid (trace), and usnic acid.

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