Research and Publications
The Vascular Plant Red Data List For Great Britain. Species Status No. 7. Joint Nature Conservation Committee, Peterborough.
(2005) British Red Data Book, Volume 1: Vascular Plants, 2nd ed. Royal Society for the Conservation of Nature, Lincoln.
(1983) Atlas Of Ferns Of The British Isles. Botanical Society of the British Isles and British Pteridological Society, London.
(1978)