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A new Cortinarius species (subgenus Phlegmacium) associated with oaks in California is described. Cortinarius xanthodryophilus is a commonly encountered representative of the fulvoid bulbopodiums and is characterized by predominantly light to dark yellow colors,
distinctly emarginated bulb, weak alkali reaction, and association with oaks. Based on phylogenetic analysis of nrITS sequences, it is placed in the /pseudoglaucopodes/humolens clade.