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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 effusa G.N.Stevens
  Biblioth. Lichenol. 72: 39 (1999). T: Savages Ridge, Mt Barney, Qld, 29 June 1986, R.Stevens NS5061; holo:BRI.  
  Thallus straggly, 4–6 cm long, pale green to grey-green; branching irregular; trunk with or without annular cracks, usually black; branches terete, 0.5–0.8 mm wide, sometimes swollen, with annular cracks towards apices, sparse elsewhere; terminal branches long, bearing many fine isidiate pseudocyphellae; apices tapered; papillae numerous on secondary and tertiary branches; fibrils numerous on primary and secondary branches. Isidia on cortex, dense, rarely only in pseudocyphellae; pseudocyphellae punctiform, sometimes raised, arranged in bands producing a ringed effect along tertiary branches and branchlets; pseudoisidia and soralia absent. Cortex glossy, unevenly cracked. Medulla compact; axis 1/3–1/2 width of branch, hyaline. Apothecia not seen. CHEMISTRY: Cortex containing usnic acid. Medulla K+ yellow; containing stictic acid (major), constictic acid (major), menegazziaic acid (minor), cryptostictic acid (minor) and norstictic acid (minor).
  An uncommon endemic in south-eastern Qld and eastern N.S.W.; grows on shrubs in cool, misty, montane habitats and occasionally on rock outcrops.  
  Stevens (2004)  

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

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