Where do fungi grow?
Fungi will grow anywhere there is a source of food and continuous moisture. Some species are very specific and will only grow in certain places. Most indoor environments contain airborne fungal spores and levels are normally influenced by outdoor concentrations. The most common species found in buildings belong to the genera Cladosporium, Penicillium, Alternaria, Aspergillus, Eurotium and Wallemia. The presence of fungi may be identified visually on suitable surface materials and by an unpleasant odour (mouldy smells). Fungi usually do not grow rapidly indoors or in large amounts if the environment is clean and dry. However, if the environment is damp high levels of airborne spores can be generated. Condensation is the principal source of moisture that promotes growth of fungi on the internal surfaces of domestic dwellings. Other factors (such as daily variation of light and temperature) can affect spore formation and growth. Fungi grow outdoors wherever continuous moisture is present.