Detailing current research on grass endophytes, this work presents procedures for isolation, inoculation, fungus and plant tissue culturing, staining and molecular methodology. Chapters on the ecology of grass hosts document the benefits of endophytes to grass hosts and discuss this topic in terms of a mathematical model. Chemical constituents of infected grasses and methods to alleviate toxic effects are identified. The current use of endophytes to increase plant hardiness in turf and forage grasses is explained. Techniques for screening and selecting endophytes and for genetic modification of endophytes are described. The text discusses the impact of endophyte-infected grasses on the environment, looks at the response of endophyte-infected grasses and grasslands to increased atmospheric CO2 and radiation, and provides techniques and procedures for studying endophytes