The "Fungi in Tree Inspection" has established itself over the years as a handy and practical reference work for daily tree inspections. It provides users with assistance in recognizing important wood-destroying fungi and enhances safety in assessing infested trees. This book presents the 15 most important species or genera of wood-decaying fungi found on street and park trees, along with their typical confusion possibilities. It contains information on the occurrence and significance of the fungal species, as well as descriptions of fruiting bodies and symptoms associated with infestation. Since the appearance of fruiting bodies (especially in fungal species with annual caps) changes significantly throughout the year, tree inspectors often encounter fruiting bodies in various stages on the tree. This book illustrates different appearances of the species through numerous images. The handbook can be used as needed for information on individual fungi or for species identification. For the latter, it is particularly suitable for a "back-to-front" approach, allowing the inspector to identify the correct fungal species based on the location of occurrence, seasonal appearance, color of the fruiting bodies, and the infested tree species. To ensure that tree inspectors can always have it on hand during their work, the compact pocket guide is intentionally small and easy to handle. Its target audience includes anyone conducting tree inspections and maintenance work on street and park trees. It is an ideal companion for tree inspectors, gardeners, foresters, and landscape architects, and has also proven to be valuable preparatory literature for the FLL-certified tree inspector examination.