Collema dichotomum – fruiting bodies and typical dichotomous branching pattern of thallus.
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.