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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. (04-10-28). Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Xanthoparmelia digitiformis (Elix & P. M. Armstr.) Filson. Xanthoparmelia. Synonyms: Parmelia conspersa var. stenophylla auct. non Ach.
Xanthoparmelia somloensis (Gyeln.) Hale; Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Parmelia digitiformis Elix & P. M. Armstr. Type: Xanthoparmelia digitiformis (Elix & P. M. Armstr.) Filson.

Biogeography: Southern hemispheric; subalpine (upland areas and subalpine zones). Continent: Australasia. Checklist records: Australia and New Zealand.

Ecology: Biotroph; lichenized; saxicolous; growing under conditions which are dry.

Thallus: Foliose, subdivided into main parts, irregular (subirregularly branched), lobed; lobes elongate, imbricate (strongly imbricate); branches applanate (moderately flattened); separate thallus parts 1.5-3 mm wide. Thallus Size and Differentiation: Up to 20 cm in diameter. Upper Surface: Lime green (pale yellow-green, blackening with age), glossy (shiny) (becoming rugulose, dull and cracked); immaculate; not isidate; not sorediate; lobulate (lobes becoming densely laciniate at thallus centre; laciniae similar to marginal lobes but narrower (1-2 mm wide), elongate, digitately to subidgitately branched, building up thallus into a thick mat). Lower Surface: Present, brown (brown to dark brown, darker towards lobe apices); attached by holdfasts; rhizinate (slender); rhizines sparse, with a narrow non-rhizinate margin, brown (concolorous with lower surface), not branched.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid (subpedicellate), up to 6 mm in diam.. Margin: Crenulate (crenulate to flexuose), indistinct (thin, involute, almost disappearing at maturity). Disk: Excavate (dull, smooth, becoming rugulose), brown.

Secondary Metabolites: Present; throughout the thallus medulla, consalazinic acid, norstictic acid, protocetraric acid, salazinic acid, and usnic acid.

Spot Tests: Cortex: KC – medulla: K + yellow changing to red, C –, KC –, PD + deep yellow (changing to orange).

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