• Church, J. M. Coppins, B. J. Gilbert, O. L. James, P. W. and Stewart, N. F. (1996) Red Data Book of Britain and Ireland: Lichens, Vol. 1; Britain. JNCC, Peterborough. ISBN 1-86107-412-3.
  • Douglass, J. (2008) The ecology and management of Ear-lobed Dog-lichen (Peltigera lepidophora) and other lichens of rocky river edges. Plantlife Scotland. ISBN: 978-1-904749-46-2.
  • Gilbert, O.L. James, P.W. & Purvis, O.W. (2009): Collema. In: Smith et al. (eds.): The lichen flora of Great Britain and Ireland. The Natural History Museum London. ISBN 978-0-9540418-8-5.
  • Thüs, H. & Schultz, M. (2008): Fungi 1st part: Lichens. In: Büdel et al. (eds.): Freshwater Flora of Central Europe, Vol. 21/1. Spektrum Heidelberg. ISBN: 978-3-8274-1594-3.