is a member of the genus Aspergillus
which includes a set of fungi that are generally considered asexual, although perfect forms (forms that reproduce sexually) have been found. Aspergilli are ubiquitous in nature. They are geographically widely distributed, and have been observed in a broad range of habitats because they can colonize a wide variety of substrates. A. niger
is commonly found as a saprophyte growing on dead leaves, stored grain, compost piles, and other decaying vegetation. The spores are widespread, and are often associated with organic materials and soil.
The primary uses of A. niger
are for the production of enzymes and organic acids by fermentation. A. niger
is also used to produce organic acids such as citric acid and gluconic acid.