Ectomycorrhizas are characterised by a sheath or mantle of hyphae surrounding the root,which may have laterals penetrating between epidermal cells of the root in what is called the Hartig net. 黑树专业须士生深醒y@⊙2 果树专业硕士生课程-yao2 Ectomycorrhizas are characterised by a sheath or mantle of hyphae surrounding the root, which may have laterals penetrating between epidermal cells of the root in what is called the Hartig net