LichenIreland
  • Verrucaria calciseda DC.
Verrucaria calciseda
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This species of calcareous rocks has its whitish thallus immersed in the rock. The discs (perithecia) are in pits and have tiny, hairline cracks radiating from some of them like a child’s drawing of the sun. The spores often have dark contents which can be a good identification character. In Ireland, the species is local but not rare (Counties Clare and Sligo).

Key characteristics

  • Thallus white with perithecia in pits and with small cracks radiating away from some of these
  • Spores about 25µm long and spore sacs (asci) often with cloudy or darkened contents.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Verrucaria calciseda DC.. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=20672 Accessed on 2017-10-20.