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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 retirugella Nyl.

Ann. Sci. Nat., Bot., sér. 4, 11: 240 (1859)

T: Nukahiva [Marquesas Islands], ad cortices ad saxa, coll. unknown; holo: H-NYL 31789 n.v.

Pyxine consocians Vain., Philipp. J. Sci., sect. C, 8: 110 (1913). T: Comiran Island, Sulu Sea, Philippines, ad cortices arboris frondosae, Sept. 1910, E.D.Merrill 7167 p.p.; holo: TUR-V n.v.; iso: BM n.v.

  Thallus 2–5 cm wide, adnate, subdichotomously lobate. Lobes irregular, discrete to contiguous or imbricate, plane to weakly convex but often slightly concave towards the tips, 0.3–1.0 mm wide, subrotund at the apices. Upper surface whitish to pale greenish grey or yellow-grey, pruinose towards the lobe tips or epruinose; isidia absent. Pseudocyphellae marginal and laminal, irregular, linear or becoming reticulate. Dactyls laminal and marginal, scattered or clustered, nodular to subcylindrical, short, ±branched, pustulate, bursting apically to produce granular soredia. Medulla white. Lower surface black in the centre, paler towards the margin; rhizines ±dense, furcate. Apothecia rare, obscurascens-type, 0.5–2.5 mm wide; disc grey-pruinose when immature. Internal stipe distinct, white to pale brown, K–, P–. Ascospores 17–22 × 6–9 μm. Pycnidia not seen.
CHEMISTRY: Cortex K+ yellow, C–, KC–, P+ yellow, UV–; medulla K+ yellow → red, C–, P+ orange; containing atranorin (minor), chloroatranorin (minor), norstictic acid (major), testacein (minor), unknown terpenes (minor).
  Occurs on bark, rarely on rocks, in coastal and montane forest in the N.T., noeastern Qld and north-eastern N.S.W. Also in Africa, Asia, Christmas Island (Indian Ocean) and several Pacific islands.  
  Elix (2009l)  

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

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