ectotrophic mycorrhiza A mycorrhiza in which the fungal component forms 2 sheath layers around the roots of a plant, the inner layer forming a sense mesh of hyphae, called the hartig net. The close association of the fungal and plant components causes changes in the root morphology giving rise to a palisade-like layer in the root cortex and increased root branching. Compare ENDOTROPHIC MYCORRHIZA.
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