The most common genera of mold fungi identified in air samples are Penicillium, Cladosporium, and Aspergillus. Others that are frequently reported include Alternaria, Stachybotrys, Aureobasidium, ...

Penicillium notatum, for example, gave rise to the drug penicillin. Which, by some estimates, has saved at least 200 million human lives. While other molds, like Aspergillus flavus, produce toxins ...