LichenIreland
  • Peltigera horizontalis (Huds.) Baumg.
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Peltigera horizontalis
© Robert Thompson
Peltigera horizontalis
© Robert Thompson
Peltigera horizontalis
© Robert Thompson
Peltigera horizontalis
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(Map updated: 11 August 2009)
Peltigera horizontalis
© Mike Simms
 

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 2018-09-23.