The descriptions of all genera in the Ophiostomatales were standardised and refined where this was required and 39 new combinations have been provided for species in the newly emerging genera and one new combination has been provided for Sporothrix. Two lineages included the type species of Grosmannia and Dryadomyces and these genera are thus reinstated and their circumscriptions redefined. In addition to the currently accepted genera in the Ophiostomatales, well-supported lineages emerged that were distinct from those genera. This was due to their high sequence divergence, which was shown to result in ambiguous taxonomic placement, even though the results of phylogenomic analysis supported their inclusion in the Ophiostomatales. The two most recently described genera, Chrysosphaeria and Intubia, were not included in the multi-locus analyses. Aureovirgo, Ceratocystiopsis, Esteya, Fragosphaeria, Graphilbum, Hawksworthiomyces, Ophiostoma, Raffaelea and Sporothrix. The results supported and confirmed the delineation of nine of the 14 currently accepted genera, i.e. We constructed phylogenetic trees based on the different gene regions and assembled a concatenated data set utilising a suite of phylogenetic analyses. DNA was amplified and sequenced for more than 200 species, representing all lineages in the Order. This framework also informed our choice of the best markers from the currently most commonly used gene regions for taxonomic studies of these fungi. A phylogenomic framework constructed from genome-wide sequence data for 31 species representing the major genera in the Order was used as a guide to delineate genera. In this study we reconsidered the generic boundaries within the Ophiostomatales. However, the delineation of some genera and the placement of various species and smaller lineages remains inconclusive. The emergence of DNA-based methods has resolved much of this confusion. The taxonomy of the Ophiostomatales was confused for many years, mainly due to the convergent evolution of morphological characters used to delimit unrelated fungal taxa. Well known examples include the Dutch elm disease fungi and the causal agents of sporotrichosis in humans and animals. They include species that are the causal agents of plant and human diseases and common associates of insects such as bark beetles. There are currently 14 accepted genera in the Order. Since that time, several of the genera have been redefined and others have been described.
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