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(Map updated: 11 August 2009)

A pioneer coloniser of wet rocks in small watercourses – especially those threading through long-established woodlands – V. denudata has a smooth, often translucent, pale green to brown thallus and rather sharp, conical black-tipped perithecia showing where the thallus cover has begun to erode. With a mean length of 21.5µm, the spores are on the small side. In Ireland, the species is local.

Key characteristics

• Pioneer aquatic lichen of small unpolluted watercourses; thallus pale green to brown, smooth and thin, discs (perithecia) conical almost pyramidal, black at the tip
• Spores rather small.

Original text submitted by Vince J. Giavarini