New (Massarinaceae, Dothideomycetes) and (Incertae sedis, Sordariomycetes) species associated with walnut ( L.) in China.

Six collections of ascomycetes were obtained from samples collected from dead branches and leaves of in Guizhou and Yunnan provinces, China. By incorporating multigene phylogenetic analysis (ITS, LSU, , SSU, , ) supplemented by morphological data, we establish two novel species, namely and . In morphology, can be distinguished from by its narrower conidia (13-16 µm vs. 27.3-35.5 µm), and is characterized by black, globose conidia (16.2 × 14.4 µm). The phylogenetic results further substantiated them as novel taxa. The present study contributes to our comprehension of the range of fungi found in , thereby expanding our knowledge of the diversity of fungi within this host.