Mycology is the discipline of biology that describes and studies a very vast group of organisms denominated fungi. This group contains around 90,000 species, and thousands are described every year, being estimated that there might be more than one million fungal species in the world, which makes the fungal kingdom one of the most important in the tree of life. Fungi are very variable, because they include both macroscopic (such as mushrooms, truffles and puffballs) and microscopic organisms.