Mycorrhizae
1. Ectotrophic mycorrhizae (EM)
- grow on exterior and between cortex cells but never penetrate root cells
- 2000 sp of plants incl. many important trees eg pines, firs, oaks, beeches and eucalypts depend on EM.
- about 5000 fungal sp mostly Holobasidiomycetes + a few Ascomycetes