Causing golden yellow, convex-concave spots, often small (5-10 mm. diam.), but sometimes confluent and large, involving half or nearly all of leaf blade, on [various species of] Populus [Species relevant to North America are listed as "Hosts" above under modern names.] . . . Distribution: [Eurasia,] locally throughout eastern North America, occasionally western North America

- AJ Mix: (1949) A monograph of the genus Taphrina^©