Psathyrella aquatica là một loài fungus from Oregon, được mô tả in the journal Mycologia in 2010.[1] It represents the first report of a gilled mushroom (Basidiomycota) fruiting underwater. It was found by Southern Oregon University professor Robert Coffan in the Rogue River in the U.S. state of Oregon.[2] Coffan found the mushroom in 2005, and his colleagues Darlene Southworth and Jonathan Frank in the biology department at Southern Oregon University confirmed that the mushroom was a unique discovery.[3]