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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
Verrucaria dufourii DC.
  in J.B.A.P. de M. de Lamarck & A.P. de Candolle, Fl.Franç., 3rd edn, 2: 318 (1805). T: Europe; holo: PC? n.v.  
  Thallus endolithic to subepilithic, continuous to sparingly rimose, pale grey, pale grey-green or pale to medium grey-brown, usually smooth and matt to slightly glossy. Algae ±globose, 6–12 µm diam. Prothallus usually a blackish line that delimits and sometimes divides thalli, occasionally not apparent; basal layer absent. Perithecia semi-immersed to superficial, hemispherical to subconical, 0.3–0.4 (–0.5) mm diam., dull to glossy black; apex plane, concave or deeply excavate, occasionally convex. Involucrellum dimidiate or extending to exciple base level, usually contiguous with the exciple, 40–80 (–100) µm thick. Exciple 15–25 µm thick, hyaline to dark brown, rarely ±black. Centrum 0.2–0.35 mm wide. Periphyses 20–30 × c. 1.5 µm. Asci 50–65 × 14–20 µm. Ascospores ellipsoidal to narrowly clavate, 12–23 × 5–10 µm
  Occurs on maritime limestone in Tas. Also found throughout western Eurasia.  
  McCarthy (2001h)  

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

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