mycology

n. branch dealing in the study of fungi; fungi native to a certain area (Botany)

Mycology (from the Greek μύκης, meaning "fungus") is the study of fungi, their genetic and biochemical properties, their taxonomy, and their use to humans  as a source for tinder, medicinals (e.g., penicillin), food (e.g., beer, wine, cheese, edible mushrooms) and entheogens, as well as their dangers, such as poisoning or infection. From mycology arose the field of phytopathology, the study of plant diseases, and the two disciplines remain closely related because the vast majority of plant pathogens are fungi. A biologist who studies mycology is called a mycologist.
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Mycology /my·col·o·gy/ the science and study of fungi. my·col·o·gy n. The branch of science dealing with the study of fungi. my·col o·gist n. [more]Mycology - Community and Resources

Noun
1. the branch of botany that studies fungi and fungus-caused diseases
(hypernym) botany, phytology

(n.)
That branch of botanical science which relates to the musgrooms and other fungi.