ABSTRACTElevenFusariumspecies were isolated from 22 of 37 soil samples collected from 37 sites in Norway from grassy areas; 33 samples were near the Arctic Circle (61–68°N).Fusarium oxysporumwas abundant at 17 sites;F. merismoidesat six sites;F. moniliformeat five sites; andF. acuminatum, F. avenaceum, F. culmorum, F. equiseti, F. proliferatum, F. sambucinum, F. semitectum, andF. solaniwere identified at 1–4 sites.Fusarium merismoideswas found only in the most northern latitudes (65°50′-68°18′N). Three of the four isolates ofF. moniliformeand 36 of 37 isolates ofF. oxysporumtested for toxigenicity caused weight losses, hematuria and hemorrhage of tissues, and death of rats when rats were fed a rice medium in whichFusariumspecies were cultured.Fusarium merismoideswas not lethal but caused substantial weight losses to rats in the 5-day test period.