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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 maculata Stirt.
  Scott. Naturalist (Perth) 6: 293 (1882). T: Somerset, South Africa, P.MacOwan & J.H.McLea s.n.; lecto: BM, fide T.D.V.Swinscow & H.Krog, Norweg. J. Bot. 23: 27 (1976).  
  Thallus shrubby, erect, to 6 cm tall, variegated olive-green and red; branching subdichotomous, sparse to moderately dense; trunk black, cracked; branches terete, 0.5–1.0 mm wide, articulated at junction of branches, with annular cracks; apices blunt or tapered, sometimes blackened; branchlets numerous; fibrils numerous at base of primary branches; papillae absent or sparse. Isidia in pseudocyphellae only, dense, short, black-tipped; pseudocyphellae numerous, punctiform, rounded or coalescing; soralia absent. Cortex thick, dull or glossy, cracked. Medulla dense; axis 1/3 width of branch, hyaline. Apothecia not seen. CHEMISTRY: Cortex containing usnic acid. Medulla K–; containing protocetraric acid (major) and virensic acid (trace).
  Occurs on rock in upland to montane areas of W.A., S.A., N.S.W., A.C.T. and Tas. Also in East Africa, South Africa and Madagascar.  
  Stevens (2004)  

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

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