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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@ Clerc, P. (04-10-27). Data set not revised; to be published after submission.

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

Type Information: Basionym: Parmelia dayiana Elix & P. M. Armstr. Type: Xanthoparmelia dayiana (Elix & P. M. Armstr.) Elix & J. Johnst.

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

Thallus: Crustose (subcrustose), subdivided into main parts, irregular, dispersed throughout and distinctly seperate (discrete at thallus periphery); lobes linear (subirregular to sublinear); branches applanate (moderately flattened); separate thallus parts.5-1 mm wide. Thallus Size and Differentiation: 2-3 cm in diameter. Upper Surface: Lime green (pale yellow-green), matt, rough (older lobes irregularly cracked and becoming areolate); immaculate; isidiate; isidia globular (globose becoming subcylindrical, becoming inflated at apices; apices epicorticate and erumpent but not sorediate), not ramified or ramified; not sorediate. Lower Surface: Present, brown (pale brown to brown); attached by holdfasts (tightly adnate); rhizinate; rhizines moderately abundant, brown (concolorous with lower surface), not branched.

Secondary Metabolites: Present; throughout the thallus medulla, fumarprotocetraric acid (other secondary metabolites: succinprotocetraric acid), protocetraric acid, and usnic acid.

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

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