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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 pycnoclada Vain.
  Philipp. J. Sci. 4: 653 (1909). T: Mt Banajao, Laguna Prov., Luzon, Philippines, Curran & Merritt cum For. Bur. 7999, 8000; syn: TUR-V.  
  Thallus shrubby, erect, 2–5 cm tall, pale green; branching dichotomous to sympodial; trunk pale or black; branches terete, to 0.9 mm wide; primary branches inflated with white rings of calcium oxalate in cracks along branches; apices tapered or broken; fibrils few to numerous, to 3 mm long; papillae mainly on primary and secondary branches, sparse to dense. Isidia absent; pseudoisidia often present amongst soredia; soralia large, concave, often encircling terminal branches and branchlets causing them to become geniculate. Cortex matt or glossy. Medulla lax and arachnoid; axis 1/5 width of branch, hyaline. Apothecia not seen. CHEMISTRY: Cortex containing usnic acid. Medulla K–; containing protocetraric acid (minor) and barbatic acid (minor), or psoromic acid (minor) and conpsoromic acid (minor), or barbatic acid (minor) and psoromic acid (major); or medulla K+ yellow: containing norstictic acid (minor) and the stictic acid aggregate.
  An uncommon species on shrubs in exposed habitats in the mountains of south-eastern Qld, eastern N.S.W., Vic. and in Nothofagus forest in Tas. Also in the Philippines and Papua New Guinea.  
  Stevens (2004)  

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

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