The host range and distribution of species of Epichloë in Britain are investigated based on herbarium material held at Kew and an assessment of the literature and other available records. Six species of the genus can now be recognised in Britain, three of which are reported for the first time, and Holcus mollis is confirmed as a host for E. clarkii. A potential seventh species, E. elymi, requires confirmation as British. Brief descriptions, with host range, and a key for the identification of these species are presented.