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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 oncodes Stirt.
  Scott Naturalist (Perth) 6: 106 (1881). T: Wellington, New Zealand, J.Buchanan; lecto: BM, n.v., fide D.J.Galloway, Fl. New Zealand Lichens 601 (1985); isolecto: GLAM.  
  Thallus shrubby, sometimes rigid, to 7 cm long, yellow-green; branching dichotomous to subdichotomous; trunk usually dark; branches terete, 0.8–1.2 mm wide, primary and secondary branches inflated; apices blunt or broken, not forked; branchlets few; fibrils short, sparse, rarely numerous; papillae sparse to moderately dense. Isidia absent; soralia small to large, often globose but not capitate, with well-defined rims, with or without pseudoisidia, abundant on branchlets and towards the apices of branches. Cortex thin, matt or glossy. Medulla sparse, arachnoid; axis 1/4–1/3 width of branch, hyaline. Apothecia uncommon, terminal; disc 5–10 mm diam., concave; fibrils moderately dense on margin, few on lower surface. Ascospores c. 8 × 5 µm. CHEMISTRY: Cortex containing usnic acid. Medulla K+ yellow → red; containing salazinic acid (major), ±traces accessory norstictic acid, galbinic acid or fatty acids.
  Widespread but not common in Tas.; grows on trees and shrubs often in association with U. xanthopoga. Also in Vic. and in New Zealand.  
  Stevens (2004)  

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

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