Mycorrhizal Mushroom form a mutually dependent,beneficial relationship withnthe roots of host plats, ranging from trees to grasses. “Myco” means mushroom while “rhizal” means roots. The filaments of cells which grow into the mushroom body are caiied mycelium. The mycelia of mycorrhizal mushroom can form an exterior sheath covering the roots of plants and are called ectomycorrhizal. Or they can invade the interior root cells of host plants and these are called endomycorrhizal. In either case, both organisms benefit from this association. Plant growth is accelerated.