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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 perplexans Stirt.
  Scott. Naturalist (Perth) 6: 103 (1881). T: Pengi, Himalayas, India, G.Watt s.n.; holo: GLAM; iso: BM.  
  Thallus shrubby, erect, to 6 cm tall, pale green to grey-green; branching subdichotomous or irregular; trunk pale; branches terete, 0.7–1.3 mm wide; primary branches somewhat inflated, irregular; apices tapered, often broken or blunt; branchlets numerous; fibrils moderately dense; papillae small, rare on primary branches, sparse to dense on secondary branches. Isidia and pseudocyphellae absent; soredia present in large soralia on terminal branches and branchlets. Cortex dull. Medulla moderately dense; axis 1/4–1/3 width of branch, hyaline. Apothecia not known. CHEMISTRY: Cortex containing usnic acid. Medulla K+ yellow → red; containing salazinic acid (major), or salazinic acid (major) and constictic acid (minor), or salazinic acid (major) and galbinic acid (trace).
  A rare species in open, moist areas to altitudes of 1000 m in south-eastern Qld, N.S.W. and Vic. Also in East Africa, India and SE Asia.  
  Stevens (2004)  

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

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