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 mekista (Stirt.) G.Awasthi | ||
| Current Sci. 54: 353 (1985); Usnea longissima subsp. mekista Stirt., Scott. Naturalist (Perth) 6: 105 (1881). T: Himalayas [precise locality unknown], J.D.Hooker & Thomson 1718; holo: GLAM; iso: BM. | ||
| Thallus pendulous, to more than 100 cm long,green to deep green; branching from primary branches subparallel; trunk pale; branches terete to irregularly slightly flattened, 0.5–1.0 mm wide, with annular cracks, partly decorticate (irregular plates of cortex remaining); branchlets short; fibrils 2–10 mm long; papillae absent. Isidia on some fibrils and dense on plates of cortex, surrounded by pulverulent tissue; pseudocyphellae raised, orbicular, mainly on fibrils and branchlets; soralia absent. Cortex dull. Medulla powdery; axis 1/2–3/5 width of branch, pink to wine-red or brown. Apothecia not seen. CHEMISTRY: Cortex containing usnic acid. Medulla K–; containing protocetraric acid (major) and ±malonprotocetraric acid (minor). |  |
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| Rare on trees at rainforest margins in eastern Qld. Also in East Africa and India. | ||
| Stevens (2004) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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