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Xanthoparmelia laxencrustans 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@ Bungartz F. (06-05-14). Data set not revised; to be published after submission.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Currently accepted name Xanthoparmelia laxencrustans Elix & J. Johnst. Xanthoparmelia. Synonyms: Parmelia encrustans auct. non Hale = Karoowia perspersa (Stizenb.) Hale; Parmeliaceae Zenker (1827); Lecanorineae; Lecanorales.

Type Information: Basionym: Xanthoparmelia laxencrustans Elix & J. Johnst. Type: Xanthoparmelia laxencrustans Elix & J. Johnst.; type specimen label data: R. Helms 86; holo: G; iso: MEL.

Taxonomic Literature: Bull. Brit. Mus. (Nat. Hist.), Bot. 15: 275 (1986).

Biogeography: Southern hemispheric. Continent: Australasia. Checklist records: Australia (very rare, endemic, in central Australia (N.T. and S.A.)).

Ecology: Lichenized; saxicolous (on sheltered rock ledges with a southerly aspect).

Thallus: Foliose (small-foliose to subcrustose in centre), irregular, lobed; lobes imbricate (contiguous to imbricate, divergent); plane or convex (in places); separate thallus parts.5-.8-(1) mm wide. Thallus Size and Differentiation: 3-6 cm in diameter. Upper Surface: Lime green (pale yellow-green), matt; fissurate (becoming cracked and areolate in older parts of thallus); immaculate; not isidate; not sorediate. Lower Surface: Present, brown or pale brown (somewhat darker towards lobe apices); attached by holdfasts (very tightly adnate); rhizinate (ca. 0.4 mm long); rhizines moderately abundant, brown (concolorous with lower surface) or pale brown, not branched.

Medulla: White.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Apothecioid, soon sessile, up to.3 mm in diam.. Disk: Excavate, dark brown.

Ascospores: 7-9 µm long, 4.5-5.5 µm wide.

Conidiomata: Present (common).

Conidia: Bifusiform; 4-5 µm long; .5 µm wide.

Secondary Metabolites: Present; usnic acid (other secondary metabolites: hypoprotocetraric acid and +/- 4-O-demethylnotatic acid (trace)).

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

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

(report generated 04.Okt.2007)

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