Two new species of Ophiostomatales (Sordariomycetes) associated with the bark beetle from Poland.

Bark beetles belonging to the genus (Coleoptera, Curculionidae, Scolytinae) are known vectors of fungi, such as the pathogenic species involved in alpine fir () mortality. Associations between hardwood-infesting species and fungi in Europe have received very little research attention. Ectosymbiotic fungi residing in and (Ophiostomatales, Sordariomycetes, Ascomycota) were commonly detected in previous surveys of the -associated mycobiome in Poland. The aim of this study was to accurately identify these isolates and to provide descriptions of the new species. The identification was conducted based on morphology and DNA sequence data for six loci (ITS1-5.8S, ITS2-28S, ACT, CAL, TUB2, and TEF1-α). This revealed two new species, described here as and . The host trees for the new species included and . can be distinguished from its closely related species, , based on conidia morphology and conidiophores that aggregate in loosely arranged synnemata. is closely related to and differs from this species in having a larger ascomatal neck, and the presence of larger club-shaped cells.