D. JEAN 2 . US Forest Service, Box 1377, Luquillo PR 00773. Obligate mycorrhizal plants are confined to soils where VA fungal spores are present.
Earthworms are the dominant soil faunain tropical wet forests.
Little is known about the interaction between earthworms and VA fungi. We found that F. cymosa showed less infection in plots with worms than in plots without worms. In contrast P. laxum and M. restioides did not showed significant effect of earthworms. Our data suggest that the effect of earthworms on mycorrhizal infection depends on a species-specific interaction between them and plants.