Ectomycorrhizae.
   The  fungal  mycelium  (mass  of  branching  hyphae)  forms  a  sheath
   ("mantle") over the surface of the root.
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   The hyphae extend into the soil, absorbing water and minerals.
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   Hyphae  also  extend into the extracellular spaces of the root cortex,
   forming  a "Hartig net", providing extensive surface area for nutrient
   exchange between the fungus and its host plant.