This chapter discusses the evolutionary origins of the molds and the reason for the black melanin pigmentation of many species. Stachybotrys chartarum thrives on the paper surface of gypsum drywall once this material is soaked with water. In contrast to other indoor molds that have small dry spores, the spores of Stachybotrys are relatively large and are produced in sticky heads at the top of sort stalks. This structure does not seem to be well adapted for dispersal in air currents, and little is known about the mechanisms by which this microbe is spread from one location to another.
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