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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