Fungi are microscopic cells in the soil. Soil Fungi can be grouped according to their different functions:
Decomposers: The Saprophytic fungi: As you can deduct from its name, the main function of these fungus is to decompose dead organic material, retaining carbon and nutrients.
Mutualists: The Mycorrhizal fungi, we read about this on the article “The social life of Forests”. These types of fungi build symbiotic relationships with the plant essentially extending the plant capacity to obtain the nutrients it needs in exchange for the exudates the plant releases.
Pathogens: Parasites fungi, in contrast to the other two types, these fungi can harm or kill a plant.