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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 pulvinata Fr.
  in J.G.C.Lehmann, Pl. Preiss. 2: 145 (1846). T: “Monte Wulgenup” [Willyung Hill], Plantagenet, W.A., L.Preiss 2716; holo: L; iso: MEL.  
  Thallus shrubby, erect, 2–3 (–5) cm tall, greenish grey; branching sparse; base of trunk blackened; branches terete, 0.5–1.0 mm wide; apices tapered or blunt, some black-tipped; short whorled branches and fibrils on primary branches; papillae absent or few; pseudocyphellae dense, punctiform, plane or concave, covering the short branches adjoining primary branches. Isidia abundant, on the cortex and in pseudocyphellae; soralia absent. Cortex smooth, dull. Medulla dense; axis 1/3 width of branch, hyaline. Apothecia not seen. CHEMISTRY: Cortex containing usnic acid. Medulla K–; lacking lichen substances, or medulla K+ yellow → red; containing salazinic acid (major) and scabrosins (trace).
  A very rare, saxicolous species in south-western W.A. Also in East Africa.  
  Stevens (2004)  

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

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