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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 trichodeoides Motyka
  Usnea 2: 421 (1937). T: Cap. b. Spei. [Cape of Good Hope], South Africa, C.H.Persoon 27 p.p.; lecto: H-ACH, fide T.D.V.Swinscow & H.Krog, Norweg. J. Bot. 25: 239 (1978).  
  Thallus pendulous, to 100 cm long, pale green or yellow-green, rarely dark grey-green; branching subdichotomous; trunk pale; branches terete, 0.5–1.0 mm wide, with numerous annular cracks; secondary branches parallel, without branchlets; fibrils numerous, smooth or cracked, to 2 cm long, sometimes with pseudocyphellae; papillae absent. Isidia absent or rare; soralia absent. Cortex dull, partly eroded along branches. Medulla dense, narrow; axis 3/4 width of branch, hyaline. Apothecia uncommon, few to numerous, subterminal or lateral, sessile on branchlets, 2–8 mm diam.; disc concave to plane; margin bearing sparse fibrils; lower surface smooth. Ascospores c. 8 × 4 µm. CHEMISTRY: Cortex containing usnic acid. Medulla K–: containing protocetraric acid (major), conprotocetraric acid (minor), virensic acid (trace) and ±malonprotocetraric acid (trace); or medulla K + yellow → orange: containing salazinic acid (major), protocetraric acid (minor), norstictic acid (trace), ±consalazinic acid and ±connorstictic acid.
  Widespread and hanging from tree trunks and branches in upland forest in Qld and south to the Richmond River district of N.S.W. Also in Norfolk Is., New Zealand and Africa.  
  Stevens (2004)  

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

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