Morphology and phylogeny of ascomycetes associated with walnut trees () in Sichuan province, China.

In Sichuan province, walnuts, consisting of , , and the hybrid × , are commercially important edible nuts, and is the most widespread plant. To date, the diversity and distribution of fungi inhabiting on have not received enough attention, although there have been studies focusing on pathogens from fruit and stem. In order to update the checklist of fungi associated with Sichuan walnuts, a survey on fungi associated with the three species from 15 representative regions in Sichuan was conducted. In this article, ten fungi distributed in two classes of Ascomycota (Dothideomycetes and Sordariomycetes) were described based on morpho-molecular analyses, and two novel species, and , a known species of , and seven new hosts or geographical records of , , , , , , and were included. Morphological descriptions and illustrations of these fungi are provided.