sourceTaxonName: Melampsora medusae
targetTaxonName: Populus deltoides
localityName: United States
referenceCitation: Newcombe, G., Stirling, B., McDonald, S.E., and Bradshaw, H.D., Jr.. 2000. %Melampsora% x%columbiana%, a natural hybrid of %M. medusae% and %M. occidentalis%. Mycol. Res. 104:261-274