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Xanthoparmelia amphixantha (Müll. Arg.) Hale

Data Set Maintenance: Data set compiled (Flora of Australia Vol. 55 Lichens-Lecanorales 2, Parmeliaceae). Data set author(s): Nöske, N. M. (04-09-18). Data set not revised; to be published after submission.

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

Type Information: Basionym: Parmelia amphixantha Müll. Arg. Type: Xanthoparmelia amphixantha (Müll. Arg.) Hale.

Taxonomic Literature: Phytologia 28: 486 (1974).

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

Ecology: Biotroph; lichenized; terricolous; growing under conditions which are dry (in mallee scrub and subarid grassland areas).

Thallus: Foliose, subdivided into main parts, anisotomic-dichotomous (dichotomously branched), dispersed throughout and distinctly seperate (discrete and separated near margins of thallus), lobed; lobes elongate (sublinear elongate); separate thallus parts.5-2 mm wide. Thallus Size and Differentiation: 1-3 cm in diameter. Thallus Outline: Orbicular (forming rosettes). Upper Surface: Yellow (pale yellow), matt, smooth; maculate (especially towards lobe margins); not isidate; not sorediate; not lobulate. Lower Surface: Present (partly canaliculate), brownish yellow (to dark brown and yellow-rimmed); rhizinate; rhizines sparse (to moderately dense), black, branched (sparsely branched).

Medulla: White.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, soon sessile (to subpedicellate), sparse, 1-2 mm in diam.. Margin: Crenulate, persistent, distinct. Disk: Excavate, brown (dark brown).

Ascospores: 9-10 µm long, 6 µm wide.

Conidiomata: Absent resp. not observed.

Secondary Metabolites: Present; throughout the thallus medulla, constictic acid, norstictic acid, stictic acid (stictic acid (major), norstictic acid (minor) and cryptostictic acid (trace)), and usnic acid, metabolite(s) of unresolved identity: present (with or without unidentified compound).

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

UV-Fluorescence: Upper thallus surface – (negative).

(report generated 04.Okt.2007)

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