Conks are the fruiting bodies of a fungus that causes wood to decay and rot inside a tree. Conks look like mushrooms and grow on the branches or trunk of a tree. Rot can be in the tree for many years before conks appear.

Some conks are annual conks. They grow and disappear in the same year, while other conks are perennial. They are woody and will grow for many years.

Conks will grow where a tree has been hurt or wounded. Sunburn, ice, lightning, snow and insects that chew holes into the trunk or branches could have caused these injuries.

Conks produce spores that are sort of like seeds. Some conks can produce 30 billion spores per day. The wind carries the spores through the air over many miles where they will land on an injured part of a tree and grow.

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