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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 convexior (Müll.Arg.) Swinscow & Krog

Norweg. J. Bot. 22: 52 (1975)

Pyxine cocoes var. convexior Müll.Arg., Bot. Jahrb. Syst. 20: 262 (1894).

T: Usambara, Deutsche Ost-Afrika [Tanzania], C.H.E.W.Holst 3137; holo: G n.v.

  Thallus 2–5 cm wide, adnate to loosely adnate, irregularly to subdichotomously lobate. Lobes radiating, discrete, ±plane to convex, 0.5–0.8 mm wide, subtruncate at the apices. Upper surface white to pale grey, sparsely pruinose at the lobe tips or epruinose, faintly white punctate-maculate; pseudocyphellae, dactyls, isidia and soredia absent. Medulla uniformly white. Lower surface black in the centre, paler towards the margin; rhizines ±dense, furcate. Apothecia common, cocoes-type, 0.5–2.0 mm wide; disc epruinose. Internal stipe distinct, white, K–, P–. Ascospores 15–20 × 6–8 μm. Pycnidia not seen.
CHEMISTRY: Cortex K+ yellow, C–, KC–, P+ yellow, UV–; medulla K– or K+ yellow → red, C–, P+ yellow or orange; containing atranorin (major), chloroatranorin (trace), norstictic acid (minor or trace).
  This rare species occurs on bark and rock in northern W.A. and north-eastern Qld. Also in East Africa.  
  Elix (2009l)  

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

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