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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
Chrysothrix xanthina (Vain.) Kalb

Biblioth. Lichenol. 78: 144 (2001)

Lepraria xanthina Vain., Cat. Welwitsch. Afr. Pl. 2(2): 463 (1901).

T: near Bango and Cambondo, Golungo Alto, Cuanza Norte, Angola, common on bark of Ficus, Dec. 1855, F.M.J.Welwitsch 447; lecto: BM, fide J.R.Laundon, Lichenologist 13: 110 (1981).

  Thallus crustose-leprose, bright yellow, unstratified, adnate, diffuse, irregularly spreading, sometimes forming scattered granules, but usually ±continuous. Soredia fine, with individual granules minutely convex to spherical, 20–80 μm wide, not agglomerated. Medulla not apparent. Photobiont cells ±globose, 15–18 μm wide, solitary or in clusters. Apothecia not seen in Australian specimens [Reported to be rare, to 0.5 mm wide, sessile, rounded; disc orange, plane to convex, heavily yellow-pruinose; margin very thin, ecorticate, soon becoming excluded; hymenium colourless, to 50 μm thick; epihymenium colourless, composed of a reticulate layer of richly branched paraphyses; hypothecium colourless, poorly developed; ascospores (2–) 3-septate, obovoid to ellipsoidal, straight or curved, often constricted in the middle, 9–14 × 3 μm (Vainio, 1901; Kalb, 2001)].
CHEMISTRY: Thallus K–, C–, KC–, P–, UV+ pale orange; containing pinastric acid (major), vulpinic acid (minor or trace), pulvinic dilactone (minor or trace).
  Common in all States and Territories, on trees and rocks in rainforest, open Eucalyptus forest, and on exotic trees in parks and along roadsides. Also in North and South America, Macaronesia, Africa, Madagascar, Asia, New Zealand and Norfolk Island.  
  Elix (2009d)  

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

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