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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 louisii Elix & J.Johnst
  in J.A.Elix, J.Johnston & P.M.Armstrong, Bull. Brit. Mus. (Nat. Hist.), Bot. 15: 279 (1986). T: slopes of Bluff Knoll, Stirling Range National Park, W.A., 25 Oct. 1982, J.A.Elix 10661 & L.H.Elix; holo: CANB.  
  Thallus small-foliose to subcrustose, very tightly adnate, to 2–4 cm wide. Lobes not imbricate, contiguous or widely separate, flat, sublinear, dichotomously branched, 0.2–0.8 (–1) mm wide. Upper surface yellow-green to yellow, darkening to deep olive-brown or blackish in older lobes, dull, emaculate, lacking soredia and isidia; developing transverse cracks in older lobes and often forming areolae 0.2–0.5 mm wide in thallus centre. Medulla white. Lower surface brown to brown-black or black; rhizines dense, simple, black or else part of lower surface adhering directly to substratum. Apothecia common, subpedicellate to sessile, 0.5–1 mm wide; disc concave, black; thalline exciple smooth, narrow, entire, ±crenulate. Ascospores 6–10 × 5–7 µm. Pycnidia common. Conidia bacilliform to sub-bifusiform, 7–8 × 0.5 µm. CHEMISTRY: cortex K-, UV-; medulla K-, C-, KC+ yellow, P-; containing usnic acid, barbatic acid, 4-O-demethylbarbatic acid and squamatic acid (trace).
  Rarely collected but possibly overlooked, endemic, on rock in south-western W.A.  
  Elix (1994z)  

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

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