What’s the difference between ecto-mycorrhizae (VAM) and endo-mycorrhizae?

Ecto-mycorrhizae form a sheath around the plant roots and mainly colonise conifers and oaks. Endo -mycorrhizae (vesicular arbuscular mycorrhizae – VAM) will penetrate the root with a structure that enable exchanges to take place between the mycorrhizal network and the plant. Most vegetables, grasses, flowers, shrubs, fruit trees and ornamentals associate with VAM.