The roots of about 80% of the seed plants in a 60 acre deciduous forest were examined for mycorhiza. The 145 species examined were distributed among 114 genera and 60 families. Mycorhiza were found in 93 spp., 76 genera, and 43 families; while in 52 spp., 38 genera, and 17 families none were found. Of the 93 spp. possessing mycorhiza only 8 (all trees) were ectotrophic, while 86 were endotrophic. Carya cordifor mis showed both types, this being the 1st report of endotrophic mycorhiza in Carya. Mycorhiza were common in Rosaceae and Compositae but uncommon in Labiatae and Scrophulariaceae. Since there is no evidence that any of the seed plants considered are benefitted by the presence of the fungi, all of the mycorhiza here reported should be classified under antagonistic nutritive conjunctive symbiosis, the fungus being parasitic on the higher plant.