 L. indigo is a mycorrhizal fungus , and as such , establishes a mutualistic relationship with the roots of certain trees ( " hosts " ) , in which the fungi exchange minerals and amino acids extracted from the soil for fixed carbon from the host . The subterranean hyphae of the fungus grow a sheath of tissue around the rootlets of a broad range of tree species , forming so @-@ called ectomycorrhizae — an intimate association that is especially beneficial to the host , as the fungus produces enzymes that mineralize organic compounds and facilitate the transfer of nutrients to the tree . 
 L. indigo <a href='drop_aux' title='1'><mark>is</mark></a>a mycorrhizal fungus , and as such , <a href='uninflect' title='2'><mark>establishes</mark></a> a mutualistic relationship with the roots of certain trees ( " hosts " ) , in which the fungi exchange minerals and amino acids extracted from the soil for fixed carbon from the host . The subterranean hyphae of the fungus grow a sheath of tissue around the rootlets of a broad range of tree species , forming so @-@ called ectomycorrhizae — an intimate association <a href='null_relcl' title='3'><mark>that</mark></a><a href='drop_aux' title='4'><mark>is</mark></a>especially beneficial to the host , as the fungus <a href='uninflect' title='5'><mark>produces</mark></a> enzymes <a href='null_relcl' title='6'><mark>that</mark></a>mineralize organic compounds and facilitate the transfer of nutrients to the tree . 
L. indigo a mycorrhizal fungus , and as such , establish a mutualistic relationship w/ da roots of certain trees ( " hosts " ) , in which the fungi exchange minerals and amino acids extracted from the soil for fixed carbon from tdahost . The subterranean hyphae of the fungus grow a sheath of tissue around thdaootlets of a broad range of tree species , forming so @-@ called ectomycorrhizae — an intimate association especially beneficial to thedast , as the fungus produce enzymes mineralize organic compounds and facilitate the dansfer of nutrients to the tda .