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Xanthoparmelia exillima (Elix) Elix & J. Johnst.

Data Set Maintenance: Data set compiled (Flora of Australia Vol. 55 Lichens-Lecanorales, Parmeliaceae). Data set author(s): Nöske, N. M. @EXCL@ Clerc, P. (04-11-02). Data set not revised; to be published after submission.

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

Type Information: Basionym: Parmelia exillima Elix. Type: Xanthoparmelia exillima (Elix) Elix & J. Johnst.

Taxonomic Literature: Bull. Brit. Mus. (Nat. Hist.), Bot. 15: 245 (1986).

Biogeography: Southern hemispheric (apparently rare but possibly overlooked); upper montane (found in upland areas with moderate rainfall). Continent: Australasia. Checklist records: Australia and New Zealand.

Ecology: Biotroph; lichenized; saxicolous.

Thallus: Crustose (subcrustose, commonly becoming areolate towards thallus centre), subdivided into main (congested) parts, isotomic-dichotomous (dichotomously branched); lobes elongate (subirregular to sublinear-elongate); plane or convex; separate thallus parts.2-.5 mm wide. Thallus Size and Differentiation: 2-4-(7) cm in diameter. Upper Surface: Lime green (darkening with age), matt; immaculate; isidiate; isidia cylindrical, not ramified or ramified (common, to 0,3 mm high), darkened at the tip (apices syncorticate and often dark or blackened); not sorediate; not lobulate. Lower Surface: Present (flat), brownish yellow (to dark brown); attached by holdfasts (tightly adnate); rhizinate; rhizines sparse, brownish yellow (concolorous with lower surface).

Medulla: White.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, soon sessile, sparse, 1-2 mm in diam.. Margin: Crenulate (then entire), smooth, distinct. Disk: Excavate to plane, brown (to dark brown) or brownish yellow.

Ascospores: 7-9 µm long, 4-5.5 µm wide.

Conidiomata: Absent resp. not observed.

Secondary Metabolites: Present; throughout the thallus medulla, norlobaridone and usnic acid.

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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