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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 subdiscreta P.M.McCarthy
  Muelleria 7: 327 (1991). T: Big Duck Bay, Hunters Is., [Bass Strait], Tas., 5 Nov. 1973, T.B.Muir 5245; holo: MEL.  
  Thallus epilithic, diffuse to determinate and usually areolate, matt, smooth, olive-green to green-black, (20–) 40–60 µm thick, dotted with black puncticulae, ecorticate; areolae angular, usually plane, 0.1–0.3 mm wide; substratum often visible between areolae. Algae broadly ellipsoidal to globose, 4–9 (–11) × 4–6 µm diam., often in vertical rows. Prothallus not apparent; basal layer absent. Perithecia semi-immersed to almost superficial, hemispherical to subglobose, 0.12–0.22 mm diam., dull to glossy black; apex usually rounded; ostiole inconspicuous or slightly depressed. Involucrellum contiguous with the exciple or arching away from it, brown-black in section, 30–60 µm thick. Exciple 10–15 µm thick, pale to dark brown. Centrum 0.08–0.15 mm wide. Periphyses 10–18 × 1.5–2.5 µm. Asci 25–35 × 10–14 µm. Ascospores ellipsoidal to elongate-ellipsoidal, 9–15 × 4–6.5 µm. Pycnidia semi-immersed, 40–60 (–80) µm diam. Conidia bacilliform, 2–3 × 0.5 µm.
  Grows on supralittoral coastal limestone, calcareous sandstone, shale, granite, gneiss and quartzite; known from W.A., S.A., N.S.W., Vic. and Tas. Also in New Zealand and Macquarie Is.  
  McCarthy (2001h)  

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

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