, a new species causing root and basal stalk rot of wild rice in the United States.

A new species of isolated from wild rice exhibiting rot and dieback of roots and stalks in California is described. sp. nov. is characterized by coenocytic hyphae, club-like appressorium, and terminal or intercalary sporangia, which are often a short distance from the end of supporting hyphae. The protoplasm is discharged through a discharge tube into an elongate transient vesicle, which soon disappears, leaving the naked protoplasm to differentiate into reniform zoospores. also produces thick-walled pigmented chlamydospores, not found in other species. In greenhouse trials, did not infect economically important crops such as rice, bean, chard, corn, carrot, lettuce, oat, radish, sweet pepper, tomato, or wheat. Phylogenetic analysis based on ITS data supports the conclusion that this organism is a new species that is most closely related to . In this paper, we describe morphological characteristics, temperature-growth relationships, pathogenicity, and phylogenetic relationships that support the description of this taxon as a new species, sp. nov. urn:lsid:zoobank.org:pub:4C63AAA4-4D4A-4679-A344-79B75121A5C6.