Lolitrem B is a toxin produced by the fungus Epichloe [1].
References
[1] Philippe G. Lolitrem B and Indole Diterpene Alkaloids Produced by Endophytic Fungi of the Genus Epichlo? and Their Toxic Effects in Livestock. Toxins (Basel). 2016 Feb 15;8(2):47. DOI:10.3390/toxins8020047