Lichen  (Calicium corynellum)

Fruiting bodies: a differentiated spore bearing structure.
Photosynthesis: metabolic process characteristic of plants in which carbon dioxide is broken down, using energy from sunlight absorbed by the green pigment chlorophyll. Organic compounds are made and oxygen is given off as a by-product.
Spores: microscopic particles involved in both dispersal and reproduction. They comprise a single or group of unspecialised cells and do not contain an embryo, as do seeds.
Thallus: type of simple plant body that does not have stems, leaves and roots.

1. 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
   
2. Jahns, H. M. (1980) Collins Guide to the Ferns, Mosses and Lichens of Britain and Northern and Central Europe. Collins, London. ISBN 0-00-219254-3
   
3. UK Biodiversity Speceis Action Plan (May 2002):
   http://www.ukbap.org.uk
   
4. British Lichen Society (May 2002):
   http://www.thebls.org.uk
   
5. Purvis, O. W., Coppins, B. J., James, P. W. & Moore, D. M. (1992). The lichen flora of Great Britain and Ireland. Natural History Museum Publications. The British Lichen society, London.