Alan Mitchell (botanist)
Alan F. Mitchell (4 November 1922 – 3 August 1995) was a British forester, dendrologist and botanist, and author of several books on trees. Born in Ilford, Essex, he almost single-handedly measured every notable tree in the British Isles, founding the Tree Register of the British Isles (T.R.O.B.I. ), which held records of over 100,000 individual notable trees at the time of his death. During the Second World War, he served with the Fleet Air Arm in the East Asia. Returning by troop ship in the Red Sea at the end of the war, he pondered his future and decided it would be trees. In 1976, the Royal Forestry Society of England, Wales, and Northern Ireland awarded him its Medal for Distinguished Service to Forestry (gold medal) during a Society meeting at Westonbirt. (From a tribute by Esmond Harris, Quarterly Journal of Forestry, January 1996, page 67). His 1987 book The Guide to Trees of Canada and North America is dedicated to his sister Christine. The book makes occasional oblique reference to a trip to North America in 1976. Mitchell's Rule states: "If there are tree stumps or felled trunks nearby, count the annual growth rings and measure the trunk circumference to find local growth rates". Selected bibliography 
  
 
 
1980. Native British Trees. Forestry Commission Research Information Note, 53/80/SILS Forestry Commission, Edinburgh. 1981. The Gardener's Book of Trees, illustrated by Joanna Langhorne. J.M. Dent, London. . First published in paperback, with corrections, 1993. 1982. The Trees of Britain and Northern Europe. Collins. (hbk)  (pbk)
1984. Decorative Trees for Country, Town and Garden. Her Majesty's Stationery Office (HMSO). Written with John Jobling. 1985. Champion Trees in the British Isles, with V. E. Hallett & J. E. J. White. Forestry Commission Field Book 10. 1987. The Guide to Trees of Canada and North America, illustrated by David More. Dragon's World, Limpsfield and London. (hbk). 1996 (published posthumously). Alan Mitchell's Trees of Britain. HarperCollins. References

External links 
Tree-register.org: Tree Register of the British Isles website
Tree-register.org: Obituary

British dendrologists
English botanical writers
English foresters
English horticulturists
1922 births
1995 deaths
Victoria Medal of Honour recipients
20th-century British botanists
20th-century English non-fiction writers
20th-century English male writers
Royal Navy personnel of World War II