Induced by a variety of insects and other organisms, plant galls range from tiny pimples to bizarre and often very attractive and exquisitely sculptured growths. Their true nature is unknown to many people, but they offer a fascinating field of study for both botanists and zoologists. Galls can be found on a wide range of both woody and herbaceous plants, with over 50 different kinds occurring on our oak trees alone. This book provides an introduction to the nature of plant galls and their formation. It describes the organisms that cause or induce galls and includes superb colour photos of over 200 of the commonest or most conspicuous of Britain’s 1,000 or so plant galls, arranged according to their host plants to facilitate identification in the field.