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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 oncodeoides G.N.Stevens
  Biblioth. Lichenol. 72: 71 (1999). T: L. Fenton, Mt Field Natl Park, Tas., G.N.Stevens 4878; holo: BRI.  
  Thallus shrubby, often subpendent, flaccid, to 10 cm long, pale green to yellow-green; branching subdichotomous; trunk usually dark; branches terete, articulated, often foveolate, 0.8–1.5 mm wide; primary and secondary branches markedly inflated; apices generally tapered, very rarely blunt; branchlets often numerous; fibrils usually sparse; papillae usually absent or sparse. Isidia lacking or few to numerous, on cortex and pseudocyphellae; pseudocyphellae punctiform, with poorly defined rims, mainly towards the apices of branches, not arranged in bands, plane or concave; soralia absent. Cortex glossy, not waxy. Medulla sparse, lax; axis 1/5–1/4 width of branch. Apothecia rare, terminal or subterminal; disc 3–6 mm diam., concave or plane; margin with sparse to moderately dense fibrils; fibrils absent on the smooth lower surface. Ascospores 8.0–9.6 × 6.0–6.4 µm. CHEMISTRY: Cortex containing usnic acid. Medulla K+ yellow → red; containing salazinic acid (major) and unknowns (faint trace).
  Endemic on shrubs and trees (including Nothofagus); rare in Vic., but widespread in Tas.  
  Stevens (2004)  

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

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