 U. inflata was first named and described by Thomas Walter in 1788 . U. radiata has often been mistaken for U. inflata because of their similar morphology and overlapping distribution . In the past , U. radiata has been misidentified as U. inflata or placed at the rank of variety . U. radiata was first identified by Alvan Wentworth Chapman in 1860 as U. inflata var. minor and noted that it was " in every way smaller " than U. inflata . John Kunkel Small in 1903 was the first to elevate U. inflata var. minor to the species level under the name U. radiata . Further studies of the two taxa were mixed on how to treat them . In 1950 , Merritt Lyndon Fernald treated them as two varieties of the same species while Henry Gleason considered them to be different , but allied species in 1952 . In 1962 , Grady Reinert and R. K. Godfrey further supported the separation of the two taxa into different species . Peter Taylor 's authoritative monograph of the genus in 1989 solidified the distinctiveness of the two species . 
