Broad, K., (1989) Lichens in Southern Woodlands. Forestry Commission Handbook No. 4. London: Her Majesty's Stationery Office.
Contains photographs of 24 species that grow on trees with a reproduction of a wall chart on lichens and pollution zones.
Coppins, B. J., (2002) Checklist of Lichens of Great Britain and Ireland. London: British Lichen Society.
Dobson, F. S., (2000) Lichens. An Illustrated Guide to the British and Irish species, 4th edn. Richmond: The Richmond Publishing Company.
General, with lots of photographs, descriptions, maps, keys.
Hodgetts, N. G., (1992) Cladonia: A Field Guide. Peterborough: Joint Nature Conservation Committee.
A small, cheap, simple, very useful field guide to this genus.
Jahn, H. M., (1981) Collins Guide to Ferns Mosses and Lichens. London: Collins.
General; contains lots of photographs, but no keys; now out-dated but still generally good.
Orange, A., (1994) Lichens on Trees. A Guide to some of the Commonest Species. British Plant Life No. 3. Cardiff: National Museum of Wales.
Contains 39 species, illustrated, although the photographs are a bit small.
Purvis, O. W., Coppins, B. J., Hawksworth, D. L., James, P. J. & Moore, D. M. (1992) The Lichen Flora of Great Britain and Ireland. London: Natural History Museum Publications/British Lichen Society.
The standard work, but highly technical. The checklist by Coppins (2002) (see above) should be used for the up-to-date names of lichens.