• Leptogium brebissonii Mont.
Click on the thumbnails to enlarge the images
Leptogium brebissonii
© Robert Thompson
Leptogium brebissonii
© Mike Simms
Leptogium brebissonii
Click on map to open large map in new window
(Map updated: 11 August 2009)

This rare, foliose, tuft-forming species has a thick, lumpy, brown-black, cushion-like thallus resembling the folds of the human brain. In the dry state, the ridges shrivel and become more flattened. Tiny granular, brownish isidia may be visible on the surface. It grows mainly in old woodland on deciduous trees such as hazel and oak. Discs are unknown in Ireland. It has a predominantly westerly distribution.

Key characteristics

  • ‘Brain’ lichen has swollen lobes when wet, becoming ridged and wrinkled when dry. L. coralloideum differs in its pale, blue-grey, cylindrical, coralloid isidia which follow the ridges of the upper surface
  • In oceanic woodlands (Counties Kerry, Galway, Clare, Mayo).

Original text submitted by Vince J. Giavarini

 Simms, M. J., (2016). Leptogium brebissonii Mont.. [In] LichenIreland. Accessed on 2019-10-14.