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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 alboverrucata G.N.Stevens
  Biblioth. Lichenol. 72: 23 (1999). T: Millaa Millaa–Ravenshoe road, 10 km from Ravenshoe, Qld, 1 May 1988, G.N.Stevens 5470; holo: BRI.  
  Thallus shrubby, erect to straggly, to 7 cm long,pale green to grey-green; branching subdichotomous to irregular; trunk cracked, short, black towards base; branches arising from the base, terete, to 1 mm wide; primary branches often swollen and thickened; apices blunt or some tapered; branchlets and long fibrils usually numerous on most branches; papillae absent or few to numerous. Isidia and/or pseudoisidia originating in pseudocyphellae, sparse to numerous; pseudocyphellae most numerous on tertiary branches and branchlets, large, convex and wart-like, white; soralia absent. Cortex smooth, glossy, thick, rather glassy in appearance. Medulla arachnoid to dense; axis 1/4–1/2 width of branch, hyaline. Apothecia not seen. CHEMISTRY: Cortex containing usnic acid. Medulla K–: psoromic acid (major) and scabrosins (major), or scabrosins only, or psoromic acid (major) and conpsoromic acid (minor); medulla K+ yellow → orange-red: salazinic acid (major) and scabrosins (major), or salazinic acid (major), norstictic acid (major) and ±scabrosins, or salazinic acid (major), norstictic acid (trace), protocetraric acid (trace) and galbinic acid (trace); medulla K+ yellow or K+ yellow-brown: scabrosins (major), protocetraric acid (minor) and stictic acid aggregate, or protocetraric acid only.
  Occurs mainly in rainforest and on adjacent fence posts in north-eastern Qld; very rare in south-eastern Qld and south-eastern N.S.W. Also in Papua New Guinea.  
  Stevens (2004)  

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

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