Contributions of North American endophytes to the phylogeny, ecology, and taxonomy of Xylariaceae (Sordariomycetes, Ascomycota)

•Endophytes illuminate Xylariaceae circumscription and phylogenetic structure.•Endophytes occur in lineages previously not known for endophytism.•Boreal and temperate lichens and non-flowering plants commonly host Xylariaceae.•Many Xylariaceae have endophytic and saprotrophic life stages and are widespread generalists.