• Verrucaria cyanea A.Massal.
Verrucaria cyanea
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This is a rare but unmistakable crustose species of exposed limestone such as pavement habitat (for example, Burren, County Clare). No other Verrucaria appears to have the micro-geometry of this taxon with adjacent thalli separated by numerous black lines converging from different angles and a sometimes pin-pricked surface topography. The conspicuous black, deeply immersed discs (perithecia) are smaller than in V. dufourii which are normally >0.3mm diam.

Key characteristics

  • Perithecia mostly immersed and <0.3mm diam.
  • On hard exposed limestone; with conspicuous black lines separating adjacent thalli.

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Verrucaria cyanea A.Massal.. [In] LichenIreland. Accessed on 2018-07-16.