Rhizopogon idahoensis is a species of fungus commonly found in the sandy soils of western North America. Its common names include Idaho truffle and sweet truffle. Some synonyms for Rhizopogon idahoensis include Tubera idahoensis, Rhizopogon occidentalis, and Rhizopogon salebrosus. These fungi are ectomycorrhizal, meaning that they form a mutualistic association with the roots of certain trees. They are highly prized by chefs and truffle hunters for their unique flavor and aroma. The discovery of Rhizopogon idahoensis has opened up new avenues for the study of truffles and the role they play in the ecology of forest ecosystems.