Arbuscular mycorrhiza
![Flax root cortical cells containing paired arbuscules](/Images/godic/202412/21/Arbuscular_mycorrhiza_microscope1110.jpg")
An arbuscular mycorrhizal fungus (plural mycorrhizae or mycorrhizas, a.k.a. endomycorrhiza, AM fungi, or AMF) is a type of mycorrhiza in which the fungus penetrates the cortical cells of the roots of a vascular plant. (Not to be confused with ectomycorrhiza or ericoid mycorrhiza.)