Extensive group of microorganisms (lat. Fungi) with about 100,000 species. After they were for a long time attributed to the plant kingdom, they are now considered a separate kingdom due to their physiological and genetic characteristics and are more closely related to animals than plants. Unlike almost all plants, they can exist without chlorophyll and, like animals, feed on organic nutrients from their environment. Fungi therefore do not develop by photosynthesis (and therefore do not need light), but must live as rot-dwellers, parasites or as symbionts of dead or living organic substances. They often enter into a mutually beneficial symbiosis with the host plants. Yeasts, which are important for fermentation, are also fungi. A large group is summarized under molds. The growth of many fungal species is favored by high relative humidity from about 70%.