LichenIreland
  • Verrucaria dufourii DC.
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Verrucaria dufourii
© Mike Simms
Verrucaria dufourii
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(Map updated: 11 August 2009)
 

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This is lichen of hard, horizontal natural limestone, abundant in places like The Burren but also on limestone tombs in some of the older churchyards. The majority of the thallus — apart from specks of pale grey or fawn-grey, is buried in the rock with only the spherical discs visible (0.3-0.5mm diam.). These have a ‘sucked-in’ apex like little rubber tyres, showing clearly from above. Between the constellations of discs, black dots (pycnidia) may often be seen. Throughout Ireland; rare in the extreme south-east.

Key characteristics

  • Thallus immersed, discs and dots (pycnidia) visible at the surface, speckled with fragments of grey or brown from below
  • Discs with distinct sunken apex; hard limestone.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Verrucaria dufourii DC.. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=20678 Accessed on 2017-11-24.