Until recently, this species was split into two varieties to reflect the way the conidia form on the conidiophore. There are only a handful of records: this is the first time it has been found on horse dung.

References: 
Hernández-Restrepo, M. et al. (2018) Multi-locus phylogeny and taxonomy of Exserohilum. Persoonia 41: p104
Seifert, K. et al. (2011) The Genera of Hyphomycetes