Serpula lacrymans, also known as dry rot fungus, is a type of wood-destroying fungus that can cause extensive damage to buildings and other wooden structures. It thrives in damp and poorly ventilated areas, such as basements and crawl spaces, and can spread quickly if left untreated. Early signs of a dry rot infestation include a musty odor, cracking or shrinking wood, and a red-brown dust on the surface of affected wood. If left untreated, dry rot can weaken the structural integrity of a building and lead to costly repairs. Therefore, it is important to promptly address any signs of dry rot and to ensure proper ventilation and moisture control in areas where wood is present.