Epichloë festucae is a systemic and seed-transmissible endophytic fungus of cool season grasses.

Epichloë festucae is found across North America, where it lives in the grass species Bromus kalmii and Elymus spp.

[3] As of 2020[update], although some centromere sequence data is available, full annotation of all open reading frames is not.

[1] Found across Europe, Asia and North Africa, and introduced in New Zealand, Australia and elsewhere, Epichloë festucae var.

lolii is associated with the grass species Lolium perenne subsp.