Our primer on the Fungi is available (currently free) on the Current Biology website. A version with extra refs inserted is available in pre-print format here. In this primer we provide a broad overview of the major evolutionary defined groups within Fungal kingdom. Our intention is make the kingdom a little less mysterious for non-mycologists and introduce some open areas of research that require integrating evolutionary, morphological, and molecular research. This was joint work with Mary Berbee, Meredith Blackwell, David Hibbett, Tim James, Joey Spatafora, & John Taylor.