endomycorrhiza
Botanical term for a type of mycorrhiza where the fungus penetrates the root cells of a plant.
Endomycorrhizae extend hyphae into the cells of plant roots.
外生菌根 (ectomycorrhiza) forms a sheath around the root and grows between cells, while 内生菌根 penetrates the root cells.
Compound of 内生 (endogenous, internal) + 菌根 (mycorrhiza). The term is a direct calque from English 'endomycorrhiza'.