The survival and growth of ectomycorrhizal and ectendomycorrhizal red pine (Pinus resinosaAit.) seedlings transplanted from a nursery onto iron tailings were examined. Seedlings were inoculated with the E-strain fungus BDG-58 (Complexipessp. Walker emend. Yang & Korf),Phialophora finlandiaWang & Wilcox,Pisolithus tinctorius(Pers.) Coker & Couch, orSuillus subluteus(Peck) Snell ex Slipp & Snell. The first two isolates are ectendomycorrhizal fungi and the last two ectomycorrhizal fungi. Two-year field data on the tailings indicated a mycorrhizal treatment effect only in root-collar diameter at the end of the first growing season. The mycorrhizal treatments had a higher survival rate than the controls, with BDG-58 andPh.finlandiaseedlings having the greatest percent survival. Results from freehand root sections indicated that ectendomycorrhizae persisted in young roots of 4-year-old red pine seedlings that had been transplanted 2 years previously.