• Peltigera rufescens (Weiss) Humb.
Peltigera rufescens
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(Map updated: 11 August 2009)

This large, but readily disintegrating when collected, brown-frosted ‘dog lichen’, is frequent in Ireland on the short turf of rather basic soils. It is usually abundantly fertile with red-brown discs that are often in-rolled. The lower surface, which attaches like velcro, is covered with buff to ochre-coloured veins towards the centre of the thallus. These veins are covered in dark, fluffy rhizinae.

Key characteristics

  • The readily broken, brown, frosted thallus (especially towards the centre of the lobes) on limey soils should distinguish this species
  • Peltigera hymenina may resemble it, but has shiny, non-pruinose lobes and avoids basic soils.

Original text submitted by Simon Davey

 Simms, M. J., (2016). Peltigera rufescens (Weiss) Humb.. [In] LichenIreland. Accessed on 2019-01-19.