• Leptogium cyanescens (Rabenh.) Körb.
Click on the image to enlarge it in a new window
Leptogium cyanescens
© Robert Thompson
Leptogium cyanescens
Click on map to open large map in new window
(Map updated: 11 August 2009)

When dry, the thin, fragile, papery-textured thallus of this blue-coloured Leptogium species is usually sufficient to name it. The numerous flap-like lobes (up to 1cm wide) are isidia which when dry, detach and can then grow on as separate plants. The species is local in Ireland, but grows best along stream valleys on mossy bark of trees such as ash. It may also occur on mossy rocks.

Key characteristics

  • The bluish colour and thin, papery thallus of this lichen is characteristic
  • The presence of flat, overlapping, lobe-like isidia help to confirm it.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Leptogium cyanescens (Rabenh.) Körb.. [In] LichenIreland. Accessed on 2019-06-25.