Black mold, Its bad out there at the moment, that is for condensation problems, in your homes, especially when it leads to the black mold problems, fungi growing on the damp walls .behind wardrobes even under your beds, to cure the problem we have to look at good ventilation or insulation, usually both,as cold bridging of the external walls often causes the moisture in the atmosphere to condense on to the walls or ceiling, giving a perfect environment for the Black mould to flourish. Stachybotrys is a genus of molds, hyphomycetes or asexually reproducing, filamentous fungi, now placed in the family Stachybotryaceae. Historically, it was considered closely related to the genus Memnoniella, because the spores are produced in slimy heads rather than in dry chains. The spores are harmful, causing respiratory to young and old.