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Arbuscular mycorrhizal fungi (AMF) belong to the phylum Glomeromycota and form distinctive structures both inside and outside plant roots. AMF penetrate the plant cell and approximately 80% of terrestrial plant species have AMF. Ectomycorrhizal fungi (EMF) are primarily Basidiomycetes and Ascomycetes and do not penetrate the plant cell. AMF associate with herbs, grasses, crops and many trees. EMF typically form with woody plants, especially in forests. In forest soils, about 90% of the biomass is fungi, while in agricultural soils, it is about 50%.