Trichoderma is a common fungus typically found in soil, litter and wood. Indoors, it can be found on a variety of materials, particularly those with a high cellulose content such as paper, fabrics and tapestries.
Trichoderma colonies are typically white in colour with blue-green tufts and a wool-like texture. Most species have a rapid growth rate.
In general, Trichoderma species are considered non-pathogenic to humans, although there have been some reports of infection in individuals with compromised immune systems.