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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 roseola Vain.
  Bot. Mag. (Tokyo) 35: 46 (1921). T: Sendai, prov. Rikuzen, Japan, 1913, A.Yasuda 138; holo: TUR-V.  
  Thallus shrubby, erect to subpendulous, 6–10 (–12) cm long, olive-green-grey; branching subdichotomous, irregular; trunk pale yellowish, transversely furrowed; branches terete,
0.5–1.0 mm wide; apices forked, tapered; branchlets sparse; fibrils sparse; papillae small. Isidia numerous, arising from small raised pseudocyphellae; pseudocyphellae few to absent on primary branches, numerous on secondary branches and branchlets, often mound-like with isidial eruption; soredia present, sometimes erupting from the soralia-like structures. Cortex thick, glossy. Medulla very compact, uniformly or patchily strawberry-pink; axis half the width of the branch, hyaline. Apothecia not seen in Australian material. CHEMISTRY: Cortex containing usnic acid. Medulla K–; containing diffractaic acid (major), barbatic acid (trace), obtusatic acid (faint trace), 4-O-demethylbarbatic acid (faint trace), 2-O-methylsquamatic acid (faint trace) and 3-hydroxybarbatic acid (faint trace), secalonic acid and an unknown pigment.
  Occurs on trees in sheltered, damp habitats in eastern Qld and north-eastern N.S.W. Also in East Africa, Tristan da Cunha (South Atlantic), the Philippines, Japan and Germany.  
  Stevens (2004)  

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

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