Rare elm tree 'could save species'
28 May 2013 Last updated at 23:43 BST
An ancient tree discovered on an island in Gloucestershire could be the saviour of its species.
The elm discovered at Cotswold water park is being used to raise a new generation of trees after Dutch elm disease killed off almost all of the UK's elms in the 1960s and 70s.
Zoe Gough spoke to lakes ecologist Benedict Pollard who found the tree.