Plant galls arise from a remarkable interaction between gall-inducing organisms and plants. Both plant enthusiasts and insect lovers, as well as mycologists, can discover and observe impressive and surprising phenomena in this fascinating interplay of nature throughout the year. For this newly released edition in a larger format, Margot and Roland Spohn have not only revised and updated Heiko Bellmann's previous work, but also expanded the range of species by including many more organisms and significantly enhanced the portraits with aspects related to biology and significance. The work describes approximately 450 different galls associated with around 120 plant genera, which are triggered by animals, fungi, bacteria, and even other plants. A comprehensive introduction and informative photos for each gall, as well as for each plant genus, facilitate identification.