REVIEWS

Books reviewed in this article: Plant Variation and Evolution . By D. B riggs and S. M. W alters . Phytochemical Methods . By J. B. H arborne . The Grasses of Bahia . By S. A. R envoize . History of the British Flora: A Factual Basis for Phytogeography . By H. G odwin . International Review of Cytology Supplement , volume 16. ‘Plant Protoplasts’. Edited by K.L. G iles . The Biosynthesis and Metabolism of Plant Hormones . Edited by A lan C rozier and J ohn H illman . Positional Controls in Plant Development . Edited by P. W. B arlow and D. J. C arr . Ethylene: Biochemical, Physiological and Applied Aspects. An International Symposium, Oiryat Anavim, Israel, January 9–12, 1984 . Edited by Y. F uchs and E. C halutz . The Lichen‐forming Fungi . By D. L. H awksworth and D. J. H ill .