Fungi grow in a wide variety of environments around the globe. Most fungi are terrestrial and are found in all temperate and tropical areas. A few species live in the Arctic and Antarctic regions, usually as part of lichens. Soil rich in organic matter is an ideal habitat for many species, and only a small number of fungi are found in drier areas or in habitats with little or no organic matter. Some fungi are parasites on plants or animals and live on or within their hosts for at least part of their life cycle. Aquatic fungi usually inhabit clean, cool fresh water, though some species are found in slightly brackish water, and a few thrive in highly polluted streams.
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