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Australian Biological Resources Study

Checklist of the Lichens of Australia and its Island Territories
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References
Xanthoparmelia praegnans (Elix & P.M.Armstr.) Elix & J.Johnst.
  in J.A.Elix, J.Johnston & P.M.Armstrong, Bull. Brit. Mus. (Nat. Hist.), Bot. 15: 308 (1986); Parmelia praegnans Elix & P.M.Armstr., Austral. J. Bot. 31: 479 (1983). T: 11.2 km north of North Creek, 14.5 km north of Mount Dutton road sign, Marree–Oodnadatta road, S.A., 21 Sept. 1975, R.B.Filson 15626a & S.Filson; holo: MEL.  
  Thallus small-foliose to subcrustose, tightly adnate, to c. 2–4 cm wide. Lobes imbricate or not, flat, sublinear, irregularly branched, 0.5–1 (–2) mm wide. Upper surface pale yellow, dull, emaculate, without soredia; older lobes irregularly cracked, becoming areolate; isidia numerous, globose, becoming subcylindrical, branched; isidia apices epicorticate, becoming inflated and erumpent but not sorediose. Medulla white. Lower surface pale brown to brown; rhizines moderately dense, simple, concolorous. Apothecia sessile, 2–3 mm wide; disc concave becoming undulating, dark brown; thalline exciple thick, entire, smooth. Ascospores 7–8 × 5–5.5 µm. Pycnidia not seen. CHEMISTRY: cortex K-, UV-; medulla K+ yellow then dark red, C-, KC-, P+ intense yellow; containing usnic acid, salazinic acid, consalazinic acid, ±protocetraric acid (trace), ±norstictic acid (trace), ±constipatic acid (trace) and ±protoconstipatic acid (trace).
  Relatively common, endemic, on rock in arid inland areas of Australia (W.A., N.T., S.A. and Qld).  
  Elix (1994z)  

Checklist Index
Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References

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