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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 fusconigrescens Nyl.
  Bull. Soc. Linn. Normandie, sér. 2, 6: 313 ('1872') [1873]. T: Collioure, Pyrenees, [SE France]; holo: H-NYL n.v.  
  Thallus epilithic, rimose to areolate, medium greenish grey to dark grey-brown, ±smooth, matt, to 60 µm thick; areolae angular, plane to slightly convex, 0.1–0.5 mm wide. Algae globose, 6–14 µm diam. Prothallus black, subtending the thallus and extending well beyond its margins. Perithecia semi-immersed to almost superficial, convex, hemispherical or subconical, (0.2–) 0.31 (–0.4) mm diam., dull black; apex rounded or somewhat flattened; ostiole usually inconspicuous. Involucrellum smooth, brown-black to black in thin section, extending to the base of the exciple, 40–60 µm thick near the apex, 60–80 µm thick at the base, contiguous with the exciple, scarcely overgrown by the thallus at maturity (then only near the base). Exciple 15–20 µm thick, brown-black. Centrum 0.15–0.25 mm wide. Periphyses 15–30 × c. 2 µm. Asci c. 70–80 × 18–25 µm. Ascospores elongate-ellipsoidal or narrowly clavate, 16–26 × 7–12 µm.
  Occurs in north-western Tas. where it was collected from a quartzite boulder above the seashore. Also in France, Germany, Scandinavia, the British Isles and in eastern and western North America.  
  McCarthy (2001h)  

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

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