Arbuscular mycorrhizas in the anthracite and bituminous coal wastes of Pennsylvania.
Most of the herbaceous plants sampled from these sites had arbuscular mycorrhizas. Gigaspora gigantea, isolated from anthracite waste, stimulated the growth of maize in sand culture. Maize with mycorrhiza grew on anthracite waste after adjustment of the pH from 4.1 to 6.4, but not on bituminous waste, even at pH 6. Lucerne, nodulated and infected with mycorrhiza, grew well in anthracite waste after the pH was raised, even without supplementary nutrients. The potential importance of arbuscular mycorrhizas in revegetation of coal wastes is discussed [RPP 54, 3697].