A general overview on the kingdom Fungi, thallus organization, systematic and life cilces. Fungi have been used as a source of food, medicine, and tinder for thousands of years – we’ll go back in the history. Fungi are principal sources of enzymes, antibiotic s and other chemicals, this means economic interests – we’ll have a look to the sector of biotechnology. Fungi maintain crucial processes in terrestrial ecosystems: We’ll focus on their communities, above and below ground, in different habitats and the Wood Wide Web.