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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 succedans Elix & J.Johnst.
  in J.A.Elix, J.Johnston & P.M.Armstrong, Bull. Brit. Mus. (Nat. Hist.), Bot. 15: 333 (1986). Based on Parmelia adpressa Kremp., Flora 59: 72 (1876), nom. illeg. non Parmelia appressa Spreng., Mantissa Prima Flor. Halens. 58 (1807). T: Rio [de] Janeiro, Brazil, A.Glaziou 3842; holo: M. ***** [Parmelia plittii auct. non Gyeln. [= Xanthoparmelia plittii (Gyeln.) Hale]: R.B.Filson, Checklist of Australian Lichens 1st edn, 73 (1972)]  
  Thallus foliose, moderately to tightly adnate, centrally lobate, forming patches to 10 cm wide. Lobes separate or barely imbricate, flat, irregularly crowded, elongate, irregularly branched, 2–2.5 (–3) mm wide. Upper surface yellow-green, darkening to olive-green or blackish, dull, shiny towards apices, smooth or rugulose, without maculae or soredia; lobe margins black near apices; isidia sparse to moderately dense, often covering thallus centre, slender, cylindrical, simple or becoming extensively branched; isidia apices syncorticate and intact. Medulla white. Lower surface pale tan to brown; rhizines moderately dense, simple, ±tufted or not, concolorous or blackening. Apothecia rare, sessile, 2–4 mm wide; disc concave, then flat or nearly so, ±with stellate cracks, dark brown; thalline exciple thick, involute, becoming undulating, isidiate. Ascospores 7–9 × 4–5.5 µm. Pycnidia not seen. CHEMISTRY: cortex K-, UV-; medulla K+ yellow, C-, KC-, P+ yellow-orange; containing usnic acid, stictic acid (major), constictic acid (minor), salazinic acid (minor), norstictic acid (trace) and cryptostictic acid (trace).
  Very rare, on rock in coastal ranges and subarid areas in southern Australia (W.A. and N.S.W.); also in South America (Brazil).  
  Elix (1994z)  

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

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