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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 immutata Elix & J.Johnst.
  in J.A.Elix, J.Johnston & P.M.Armstrong, Bull. Brit. Mus. (Nat. Hist.), Bot. 15: 266 (1986). T: south of Barrow Creek along the Stuart Highway, N.T., 13 Sept. 1983, J.A.Elix 11209 & L.A.Craven; holo: CANB.  
  Thallus foliose to subcrustose, very tightly adnate, to c. 3–5 cm wide. Lobes barely imbricate or not, flat, irregular, irregularly branched, 0.2–1 (–1.5) mm wide. Upper surface pale yellow-green, shiny at least near lobe apices, emaculate, smooth at margins, becoming transversely or irregularly cracked, without soredia; older lobes becoming rugulose and eventually areolate; isidia in thallus centre, globose then cylindrical, simple or expanding laterally and becoming branched and shortly coralloid; isidia apices syncorticate and solid. Medulla white. Lower surface shiny, pale tan to light brown, darker at lobe apices; rhizines sparse to moderately dense, short, simple, concolorous. Apothecia sessile, 0.5–1 mm wide; disc concave then ±flat, dark brown; thalline exciple smooth, ultimately isidiate, thick, entire, involute, becoming thinner. Ascospores 6–10.5 × 3.5–5.5 µm. Pycnidia not seen. CHEMISTRY: cortex K-, UV-; medulla K-, C-, KC-, P-; containing usnic acid, constipatic acid, protoconstipatic acid, scabrosin-4-acetate 4'-hexanoate, ±scabrosin-4,4'-diacetate and unidentified scabrosin derivatives.
  Rare, endemic, in central Australia (W.A., N.T., S.A. and Qld) on rock ledges with a southerly aspect in arid areas.  
  Elix (1994z)  

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

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