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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 sargentii (Elix & J.Johnst.) Elix
  Mycotaxon 87: 401 (2003)
Paraparmelia sargentii Elix & J.Johnst., Mycotaxon 32: 410 (1988). T: E of Narrogin on road to Harrismith, W.A., 18 Aug. 1987, J.A.Elix 21641 & M.V.Sargent; holo: CANB.
  Thallus small-foliose to subcrustose, adnate, forming irregular rosettes to 3.5 cm wide. Lobes rarely imbricate, radiating at apices, sublinear, subdichotomously branched, 0.3–0.6 (–1) mm wide. Upper surface pale ash grey, black-margined towards lobe apices, convex, smooth and shiny at lobe apices, becoming dull, developing dense granular pruina subapically, emaculate, lacking soredia and isidia; older lobes becoming rugose and areolate. Lower surface pale tan to brown, darker towards lobe apices; rhizines sparse, simple, tufted or not, thick, to 0.2 mm long, concolorous. Apothecia scattered, subpedicellate, to 3 mm wide; disc concave becoming undulate-distorted, pale brown to brown; thalline exciple thick, entire then ±cracked, pruinose. Ascospores (immature) c. 3.5 × 2 µm. Pycnidia numerous, slightly emergent, minute, punctiform. Conidia 6–7 × 1 µm. CHEMISTRY: cortex K+ yellow; medulla K-, C-, KC-, P-; containing atranorin, protoconstipatic acid (major) and constipatic acid (minor).
  This rare endemic species is currently known only from the type locality in south-western W.A.  
  Elix (1994n)  

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

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