Mycology is the scientific study of fungi, which are organisms that include mushrooms, molds, and yeasts. Fungi are important to the environment because they help break down organic matter and recycle nutrients. Mycology also includes the study of fungal diseases and their effects on plants, animals, and humans. Mycologists study the structure, physiology, genetics, ecology, and biochemistry of fungi. They also investigate the interactions between fungi and other organisms, such as bacteria, viruses, and plants.