LichenIreland
  • Peltigera horizontalis (Huds.) Baumg.
Click on the thumbnails to enlarge the images
Peltigera horizontalis
© Robert Thompson
Peltigera horizontalis
© Robert Thompson
Peltigera horizontalis
© Robert Thompson
Peltigera horizontalis
Click on map to open large map in new window
(Map updated: 11 August 2009)
Peltigera horizontalis
© Mike Simms
 

Click here to view an interactive map of the Northern Ireland dataset as currently collated by CEDaR.
The map is generated through the NBN Gateway using their Interactive Mapping Tool.

 

This large, foliose, dark-grey to brown, dog lichen that attaches to the trunk and bases of mossy trees in old, undisturbed woodland like strips of Velcro has smooth lobes and bears horizontally-held oval to circular discs. It is distinctive when seen and occurs most frequently in woodland with a long history of continuous canopy, especially in western Ireland.

Key characteristics

  • The reddish-brown fruits that are held more or less flat, strongly suggest this species
  • The underside criss-crossed by dark (sometimes almost black) veins on a white background that support bundle rhizinae (root-like attachment structures) is diagnostic in material without discs.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Peltigera horizontalis (Huds.) Baumg.. [In] LichenIreland.
http://www.habitas.org.uk/lichenireland/species.asp?item=19327 Accessed on 2017-11-18.