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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
Xanthoparmelia dichotoma (Müll.Arg.) Hale
  Phytologia 28: 487 (1974); Parmelia dichotoma Müll.Arg., Flora 69: 257 (1886). T: Braidwood district, N.S.W., Nov. 1884, W.Bäuerlen 204; lecto: G; isolecto: BM, FH, FH-TAYL, M, fide M.E.Hale, Smithsonian Contr. Bot. 74: 101 (1990).  
  Thallus foliose, loosely adnate, to 7–10 cm wide. Lobes loosely imbricate, linear-elongate, divaricate, with irregular dichotomous branching, to 15 mm long, 1–2.5 mm wide; apices often subascending, exposing lower surface. Upper surface pale yellow-green to grey-green, shiny, emaculate, smooth, lacking soredia and isidia; lobe margins shiny, black or brown. Medulla white. Lower surface shiny or matt, rugose, black or rarely partly dark brown, sometimes somewhat paler towards apices; rhizines very sparse, simple, robust, concolorous. Apothecia rare, subpedicellate, to 6 mm wide; disc concave to flat, shiny, brown; thalline exciple smooth, shiny, thick, entire or crenulate. Ascospores 5–8 × 3.5–5 µm. Pycnidia rarely developed. Conidia not seen. CHEMISTRY: cortex K-, UV-; medulla K-, C-, KC+ rose, P-; containing usnic acid, loxodin and norlobaridone.
  Relatively common, on rock in cooler, upland areas of southern Australia (W.A., N.S.W., A.C.T., Vic. and Tas.) with higher rainfall; also on the North Island of New Zealand.  
  Elix (1994z)  

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

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