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*Aspergillus niger* is an ascomycete fungus that forms black, grainy colonies and reproduces through conidia, which are asexual spores. These conidia develop on vesicles located at the tips of conidiophores, which are 1–3 mm in length. *A. niger* is a known pathogen that can contaminate food and, in some cases, infect humans. However, it also has useful industrial applications, being used to produce substances such as citric acid and various enzymes. *A. niger* is also used in the fermentation process for the production of pu-erh tea. ## Keywords Fungi Ascomycota Pezizomycotina Eurotiomycetes Eurotiales Trichocomaceae Aspergillus
