Which of the following statements is not true about mycorrhizae?

A)Ectomycorrhizae form a dense sheet over the plant root, commonly observed in woody species.
B)Arbuscular mycorrhizae penetrate cell walls of the root cortex, forming structures called "little trees."
C)Roots can form a mycorrhizal symbiotic relationship with all species of fungi.
D)Fungi and bacteria can interact in ways that help plants respond to stressful conditions, such as contaminated soil.
E)Treating seeds with mycorrhizal fungi can improve crop yield.