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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
Pyxine petricola Nyl.

in J.M.Crombie, J. Bot. London 14: 263 (1876)

T: Island of Rodriguez, 9 Dec. 1874, I.B.Balfour 2391 (Transit of Venus Expedition); holo: BM n.v.

Pyxine subvelata Stirt., Trans. & Proc. New Zealand Inst. 30: 396 (1898). T: Jimbour, Qld, June 1895, F.M.Bailey s.n.; holo: BM.

  Thallus 2–6 cm wide, adnate to loosely adnate, subdichotomously lobate. Lobes radiating or irregular, contiguous to imbricate, plane to concave, rarely convex, 0.7–1.2 mm wide, subrotund to truncate at the apices. Upper surface white to pale grey, greenish grey or yellowish grey, pruinose in patches, matt or glossy; dactyls, soredia and isidia absent. Pseudocyphellae ±distinct, marginal and laminal, usually restricted to the peripheral parts of the lobes, rarely becoming reticulate. Medulla uniformly white. Lower surface black in the centre, paler towards the margin; rhizines dense, short, ±furcate. Apothecia cocoes-type, 0.5–1.5 mm wide; disc epruinose. Internal stipe distinct; upper part rose to orange-red, K+ purple, P–; lower part white, K–, P–. Ascospores 14–20 × 5–9 μm. Conidia bacilliform, 3–4 × c. 1 μm.
CHEMISTRY: Cortex K–, UV+ yellow; medulla K–, C–, KC–, P–; containing lichexanthone (major), triterpenes (major or minor).
  Occurs on rock and bark in coastal and hinterland forest in western W.A. and eastern Qld. Also in Asia, Africa, South America and the Pacific (Hawaiian Islands and Micronesia).  
  Elix (2009l)  

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

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