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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 digitiformis (Elix & P.M.Armstr.) Filson
  Brunonia 7: 205 (1984); Parmelia digitiformis Elix & P.M.Armstr., Austral. J. Bot. 31: 470 (1983). T: Booroomba Rocks, 11 km south-west of Tharwa, A.C.T., 11 July 1979, J.A.Elix 6173; holo: MEL. ***** [Parmelia conspersa var. stenophylla auct. non Ach. [= Xanthoparmelia somloensis (Gyeln.) Hale]: W.A.Weber & C.M.Wetmore, Beih. Nova Hedwigia 41: 71 (1972)]  
  Thallus foliose, loosely adnate to moderately adnate, to 20 cm wide. Lobes strongly imbricate, flat, subirregular, elongate, subirregularly branched, 1.5–3 mm wide; becoming densely laciniate at thallus centre; laciniae similar to marginal lobes but narrower (1–2 mm wide), elongate, digitately to subdigitately branched, building up thallus into a thick mat; apices flat, ±round. Upper surface pale yellow-green, blackening with age, shiny, emaculate, becoming rugulose, dull and cracked, lacking soredia and isidia; lobe margins often blackened. Medulla white. Lower surface brown to dark brown, darker towards lobe apices; becoming rugulose, ridged and ±devoid of rhizines near lobe apices; rhizines sparse, simple, slender, concolorous. Apothecia subpedicellate, to 6 mm wide; disc dull, concave, smooth becoming rugulose, dark brown; thalline exciple thin, crenulate to flexuose, involute, almost disappearing at maturity. Ascospores 7–10 × 4–6 µm. Pycnidia common. Conidia bifusiform, 5–6 × 0.5 µm. CHEMISTRY: cortex K-, UV-; medulla K+ yellow then dark red, C-, KC-, P+ yellow then orange; containing usnic acid, salazinic acid (major), consalazinic acid (minor), ±norstictic acid (trace) and ±protocetraric acid (trace).
  Widespread on rock in upland areas and drier subalpine zones of southern Australia (W.A., S.A., N.S.W., A.C.T., Vic. and Tas.); also on both islands of New Zealand.  
  Elix (1994z)  

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

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