By RA Lelliott (Dunez, Head of the Plant Pathology Station, INRA, Bordeaux; D.), D. Stead
By HARVEY MOTULSKY
By Mantell, S.H. Mantell, J.A. Matthews, R.A. McKee (Department of Botany, University of Leicester)
By W. D. P. Stewart
By Agriculture, Fish.& Food, Min.of
By ALLEN J. COOMBES
By G. M. Clarke, R.E. Kempson
By Natural History Museum
By Royal Botanic Gardens, Kew
By Wilfrid Blunt
By Maggie Campbell-Culver
By Arthur W. Galston
By Kariem El-Boghdadly
By S.T. Trudgill