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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. (06-06-03). Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Xanthoparmelia subcrustacea (Gyeln.) Hale. Xanthoparmelia. Synonyms: Parmelia conspersa var. stenophylloides Müll. Arg.
Parmelia subcrustacea Gyeln.; Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Parmelia subcrustacea Gyeln. Type: Parmelia conspersa var. stenophylloides Müll. Arg.; type specimen label data: R. Helms 95; lecto: G.

Biogeography: Southern hemispheric. Continent: Australasia. Checklist records: Australia (uncommon, endemic, areas of southern and central Australia (W.A., N.T., S.A., N.S.W., A.C.T. and Vic.)).

Thallus: Foliose, irregular; lobes elongate or linear (sublinear to subirregular), horizontal; plane; separate thallus parts.5-1-(1.5) mm wide. Thallus Size and Differentiation: 3-4 cm in diameter; apex rounded (+/- rotund). Upper Surface: Lime green (darkening with age, lobe margins commonly black, particularly towards apices), matt or glossy (shiny); fissurate; immaculate; not isidate; not sorediate. Lower Surface: Present, pale brown (often somewhat darker to smoky-grey near lobe apices); attached by holdfasts; rhizinate; rhizines moderately abundant, brown, not branched.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, soon sessile, 1-1.5 mm in diam.. Margin: Distinct (entire and involute, becoming undulating). Disk: Excavate, dark brown.

Secondary Metabolites: Present; usnic acid (other secondary metabolites: hypostictic acid, hyposalazinic acid, +/- hypoconstictic acid and +/- constipatic acid).

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

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