Xenoacrodontiaceae Crous

Index Fungorum Number: IF 841843

Xenoacrodontiaceae (Hypocreales) was erected by Crous et al. (2021) to accommodate the monospecific hyphomycetous genus Xenoacrodontium. The species in Xenoacrodontiaceae are characterized by hyaline, smooth-walled, branched, septate hyphae and conidiophores reduced to conidiogenous cells arising directly from the hyphae. Conidiogenous cells are hyaline, smooth- and thin-walled, subulate, straight to flexuous, proliferating sympodially, forming a rachis in the upper part, with multiple subdenticulate loci, slightly thickened and refractive. Conidia are solitary, hyaline, aseptate, smooth- and thin-walled, guttulate and ellipsoid with obtuse apex. The hilum is slightly thickened and not darkened. Xenoacrodontium juglandis is the single species of the family, which is described on Juglans regia (Juglandaceae) from the Netherlands (Crous et al. 2021). The LSU phylogeny showed that the Xenoacrodontiaceae is sister to the Hypocreaceae with uncertain phylogenetic placement (Crous et al. 2021). However, further species discoveries and the stable phylogeny of the family are needed. The family is so far known only as asexual morphs and saprobes.