Mycorrhiza
Mycorrhiza (from Greek μύκης mykes, 'fungus', and ῥίζα rhiza, 'root') is a mutualistic symbiotic association between a fungus and a plant. The fungus colonizes the root system of a host plant, providing increased water and nutrient absorption capabilities while the plant provides the fungus with carbohydrates formed from photosynthesis. This association is crucial for the survival and health of the vast majority of terrestrial plants.