Preface. 1. Brief Introduction to Fungi; J.J. Worrall. 2. Defining Individual Fungal Boundaries; A.D.M. Rayner, et al. 3. Defining Species in the Fungi; T.C. Harrington, D.M. Rizzo. 4. The Evolution of Sex and Recombination in Fungi; J.K.M. Brown. 5. Gene Flow in Fungi; S.O. Rogers, M.A.M. Rogers. 6. Somatic Incompatibility in Fungi; M. Malik, R. Vilgalys. 7. Genomic Conflict in Fungal Mycelia; M. Ramsdale. 8. Fungal Demography - Mushrooming Populations; J.J. Worrall. 9. Population Structure of Oomycetes; A. Drenth, S.B. Goodwin. 10. Population Structure of Ascomycetes and Deuteromycetes; J.C. Correll, T.R. Gordon. 11. Population Structure of Basidiomycetes; E.M. Hansen, R.C. Hamelin. 12. Viruses in Fungal Populations; M.G. Milgroom. 13. Fitness, Continuous Variation and Selection in Fungal Populations; C.M. Brasier. Index.