79 genera accepted in Boletales and their type species are described with information of their ecology, distribution and nomenclature and illustrated when appropriate. Generic synonyms (both taxonomic and nomenclaturial) with their type species are indicated under the appropriate genera. A key to the accepted genera is provided together with a preliminary classification of the order based on recent investigations. There are two sets of references, one to useful illustrated mycofloras and one with general references relevant to Boletales. A glossary and an index are provided.