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 inermis Motyka | ||
| Usnea 1: 109 (1936). T: ad flumen Murray [Murray R., Vic.], 1872, H.Wawra 451; holo: W. ****Usnea dasypogoides var. angulosa Müll.Arg., Flora 69: 254 (1886); U. angulosa (Müll.Arg.) Motyka, Usnea 2: 512 (1937). T: Upper Swan R., W.A., Miss Sevell; holo: G. | ||
| Thallus shrubby, tangled, to 5 cm long,yellow-green or pale greenish yellow, rarely pale green; branching irregular, dense, occasionally sparse; trunk usually pale; branches terete to slightly angular, 0.5–1.0 mm wide, sometimes foveolate and slightly inflated at the base; apices tapered, usually forked, sometimes broken or blackened; fibrils dense; papillae absent or rare. Isidia in pseudocyphellae only, dense, often black-tipped; pseudocyphellae dispersed along entire length of branch, punctiform, becoming confluent, often eroding, concave, elongate to effigurate towards apices; soralia absent. Cortex matt, not waxy. Medulla arachnoid; axis 2/5–1/2 width of branch, hyaline. Apothecia absent or rare, lateral or subterminal, 2–3 (–6) mm diam.; disc concave; margin with few to moderately numerous fibrils; lower surface smooth. Ascospores c. 8 × 5 µm. CHEMISTRY: Cortex containing usnic acid. Medulla K–: containing psoromic acid (major), conpsoromic acid (minor) and ±2’-O-demethylpsoromic acid (trace), or squamatic acid, or diffractaic acid (minor) and psoromic acid (minor), or diffractaic acid (minor) and squamatic acid (minor), or containing no lichen substances. |  |
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| Occurs in W.A., S.A., south-eastern Qld, N.S.W., A.C.T., Vic. and Tas. Common on twigs of Eucalyptus, Acacia etc. in open forest from 300 m to 1800 m; rarely on rock. Also in New Zealand and Chile. | ||
| Stevens (2004) | ||
| Checklist Index |
| Introduction | A–D | E–O | P–R | S–Z | Oceanic Islands | References |
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