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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
Usnea xanthopoga Nyl.
  Compt. Rend. Hebd. Séances Acad. Sci. 83: 89 (1876). T: Campbell Is., New Zealand, 1874, M.Filhol; holo: H-NYL; iso: BM.  
  Thallus shrubby, erect, rarely straggly, to 8 cm long, pale green to yellowish green; branching ±dichotomous; trunk with annular cracks, usually black; branches terete, to 1.5 mm wide, ±slightly inflated, rarely faveolate, articulate, with or without cracks bordered by white rings; primary and secondary branches usually much thicker than tertiary branches; apices tapered or blunt; short branchlets often arising from primary and secondary branches; fibrils sparse or absent; papillae, when present, dense on primary and secondary branches. Isidia in pseudocyphellae only, dense, small; pseudocyphellae sparse or absent on primary and secondary branches, common on terminal branches, not in bands, punctiform, round, concave or plane, not raised, usually large on branchlets; soralia absent. Cortex thick, matt to glossy, sometimes waxy. Medulla dense; axis 1/4–1/2 width of branch, hyaline. Apothecia not seen. CHEMISTRY: Cortex containing usnic acid. Medulla K–; containing fumarprotocetraric acid (major), protocetraric acid (minor), ±lobaric acid (minor), ±physodalic acid (faint trace), malonprotocetraric acid (trace), confumarprotocetraric acid (faint trace), succinprotocetraric acid (trace), conprotocetraric acid (trace) and hypoprotocetraric acid (trace), or protocetraric acid, or lacking lichen substances.
  Occurs in montane rainforest (on Nothofagus) at one locality in N.S.W.; also in Vic. and common in Tas. Also in Macquarie Is., New Zealand and South America.  
  Stevens (2004)  

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

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