Serpula lacrymans is a wood-decaying fungus known for causing dry rot in timber. It thrives in damp, poorly ventilated environments, breaking down cellulose in wood and leading to structural damage. This fungus can spread rapidly, often going unnoticed until significant damage has occurred. The fruiting body of Serpula lacrymans appears as a white to yellowish mycelium, sometimes with a reddish-brown color on the surface. It can produce spores that disperse through the air, allowing it to colonize new areas. Effective prevention includes controlling moisture levels and ensuring proper ventilation in buildings.