ErM (F) = ericoid mycorrhizal (fungi)
(e.g. mountain laurel, blueberries, rhododendron, heather)
AM (F) = arbuscular mycorrhizal (fungi)
(e.g. maple, ash, cherry, most tropical trees)
EcM (F) = ectomycorrhizal (fungi)
(e.g. oak, hickory, most gymnosperms)
SAP = saprotrophs