Aspergillus versicolor is a slow-growing species of filamentous fungus commonly found in damp indoor environments and on food products.

[5][6] It is among the most common of indoor molds, often reported in dust and in water-damaged building materials, such as wallboards, insulation, textiles, ceiling tiles, and manufactured wood.

[7][8] Aspergillus versicolor is a highly resilient fungus, explaining its wide global distribution in a variety of environmental conditions.

[1] Like other members of its genus, A. versicolor displays moderate xerophillic characteristics, meaning that it can grow in conditions with low water activity (down to aW of 0.75–0.81 in the optimal temperature range).

[1][12][13] Other extreme habitats from which the fungus has been reported include peat bogs, deglaciated Arctic soil, and uranium mines.

[1] Colonies are typically white at the start of development, and change to yellow, orange, and green, often with pink or flesh hues intermixed, as they mature.

[1][6] Aspergillus versicolor is able to grow on a variety of surfaces, including those that are nutrient-deficient, because it is autotrophic for most growth substances and the macronutrient riboflavin.

[10] Additionally, A. versicolor has high activity levels of xylanase, an enzyme that breaks down hemicellulose in plant cell walls.

For example, a sesquiterpenoid nitrobenzoyl ester isolated from hyphae have been shown to be potent inhibitor of human breast and colon cancer cell lines.

[15] Aspergillomarasmine A has been reported to inhibit two antibiotic resistance carbapenemase proteins in bacteria.King, Andrew M.; Sarah A. Reid-Yu; Wenliang Wang; Dustin T. King; Gianfranco De Pascale; Natalie C. Strynadka; Timothy R. Walsh; Brian K. Coombes; Gerard D. Wright (2014).

[18] Additionally, mycotoxins can act as immunosuppressants, which may explain some increased prevalence of frequent infections among inhabitants of damp buildings.

[19] Fungi provide an effective, economic, and environmentally-friendly method of removing harmful wastes that accumulate as byproducts of industrial activities.