United States, Minnesota, Swift, In SW-201,a decrepit, 3 acre woodlot.;;122N;39W;19
45.3617284 -95.6135646 +-800m.
Decrepit woodlot that was possibly grazed in the past. Populus deltoides and Acer negundo were the tree species.
Found only in small groups & only infrequently. [aecia of rust fungus on leaf cannot be identified conclusively, =? Uromyces acuminatus?, 30 Mar 1989, John W. McCain]