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Xanthoparmelia dichotoma (Müll. Arg.) Hale

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 dichotoma (Müll. Arg.) Hale. Xanthoparmelia. Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

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

Taxonomic Literature: Phytologia 28: 487 (1974).

Biogeography: Southern hemispheric; montane (in cooler, upland areas with higher rainfall). Continent: Australasia and Asia-Tropical (relatively common). Checklist records: Australia and New Zealand.

Ecology: Biotroph; lichenized; saxicolous.

Thallus: Foliose, subdivided into main parts, irregular (divaricate, with irregular dichotomous branching, to 15 mm long), lobed; lobes elongate or linear, imbricate (lobes loosely imbricate); separate thallus parts 1-2.5 mm wide. Thallus Size and Differentiation: 7-10 cm in diameter. Upper Surface: Lime green (pale yellow-green to grey-green, lobe margins black or brown), glossy (shiny), smooth; immaculate; not isidate; not sorediate. Lower Surface: Present, black (or rarely partly dark brown, sometimes somewhat paler towards apices); attached by holdfasts (loosely adnate); rhizinate (robust); rhizines sparse (very sparse), black (concolorous with lower surface), not branched.

Medulla: White.

Reproduction Strategy: With sexual (and possible asexual) stages (subpedicellate). Ascocarps: Apothecioid, sparse, up to 6 mm in diam.. Margin: Crenulate (or entire), smooth, distinct (thick). Disk: Excavate to plane, brown (shiny).

Ascospores: 5-8 µm long, 3.5-5 µm wide.

Conidiomata: Present (rarely developed, conidia not seen).

Secondary Metabolites: Present; throughout the thallus medulla, norlobaridone and usnic acid (other secondary metabolite: loxodin).

Spot Tests: Cortex: KC – medulla: K –, C –, KC + pink (rose), PD –.

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

(report generated 04.Okt.2007)

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