Wood destroying fungi, also known as wood-decaying or wood-rotting fungi, are a type of fungi that feed on cellulose and lignin, the main structural components of wood. They can cause significant damage to wooden structures, such as buildings, furniture, and utility poles. There are many different species of wood destroying fungi, including brown rot, white rot, and soft rot. Brown rot fungi break down cellulose and leave behind a dry, brown, crumbly residue, while white rot fungi break down both cellulose and lignin, resulting in a white, spongy mass. Soft rot fungi cause the wood to become soft and slimy and are often associated with high moisture conditions. The damage caused by wood destroying fungi can weaken the structural integrity of the wood and make it more susceptible to collapse. It is important to address any moisture issues and to properly maintain and protect wooden structures to prevent the growth of wood destroying fungi.