Hysterangiales revisited: expanded phylogeny reveals new genera and two new suborders.

(, ) is a diverse, nearly cosmopolitan order of predominantly hypogeous, sequestrate, ectomycorrhizal fungi. Expanding on previously published phylogenies, we significantly increased sampling of specimens, emphasizing representatives from Australia. Using protein-coding genes (adenosine triphosphate synthase subunit 6) and (translation elongation factor 1-á), we recovered 26 provisional novel genera, and corroborated existing genera and families. Further, two new suborders (. and .) and a new family (.) are described, and three new combinations made to . Aspects of classification and biogeography are presented.