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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 calciseda DC.
  in J.B.A.P. de M. de Lamarck & A.P. de Candolle, Fl. Franç., 3rd edn, 2: 317 (1805). T: France; holo: PC? n.v.  
  Thallus endolithic, continuous, chalky white to pale grey, rarely medium grey, smooth, usually matt, frequently with fine cracks radiating from the perithecia. Algae globose, 7–15 µm diam. Prothallus black, delimiting and intersecting thalli, or not apparent. Perithecia ±entirely immersed in the substratum, 0.2–0.3 (–0.4) mm diam., black, frequently leaving minute pits after decay; apex plane to convex, 0.13–0.24 mm diam.; ostiole usually inconspicuous. Involucrellum absent. Exciple 15–22 µm thick at the base and sides and dark brown to black, at the apex black and c. 30 µm thick. Centrum 0.16–0.35 mm wide. Periphyses 20–30 × c. 1.5 µm. Asci 50–70 × 14–18 µm. Ascospores narrowly to broadly ellipsoidal, 13–24 × 7–13 µm.
  Occurs on limestone in W.A., Qld and N.S.W.; reports from S.A. and Vic. (R.B.Filson, Checklist Austral. Lichens & Allied Fungi 147, 1996) could not be confirmed. Also throughout northern Eurasia, as well as Ethiopia, Cuba, California and New Zealand.  
  McCarthy (2001h)  

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

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