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 elata Motyka | ||
| Usnea 1: 57 (1936). T: M'Palas ad litus occidentalis lacus Tanganjika, [M'Palas, western beach, L. Tanganyika, Zaïre], 1898, Guillemé s.n.; holo: TUR-V 00326. | ||
| Thallus erect to subpendulous, to 15 cm long, grey-green to yellowish grey; branching subdichotomous to irregular; trunk pale to black; branches terete; fibrils to 5 mm long on main branches; branchlets and papillae absent. Isidia sparse, solitary, rarely clustered, eroding to punctiform pseudocyphellae; soralia absent. Cortex cracked. Medulla dense, with a yellow to pink layer surrounding axis; axis 3/4 width of branch, hollow. Apothecia not seen. CHEMISTRY: Cortex containing usnic acid. Medulla K–; containing diffractaic acid (major), 2-O-methylobtusatic acid (trace), baeomycesic acid (trace), 4-O-demethylbarbatic acid (trace) and 3-α-hydroxybarbatic acid (trace). |  |
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| Very rare on Allocasuarina torulosa in eastern Qld; also in Central Africa. | ||
| Stevens (2004) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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