Click on map to open large map in new window
(Map updated: 11 August 2009)

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