The reason is because mushrooms feeds on dead and decaying substance around the tree, hence mushrooms are decomposers.
What is a mushroom?
Basically a mushroom is a fungi with fleshy body, some mushrooms are edible while some are poisonous.
When are mushroom is seen growing on a tree, it means the presence of dead substance or even part of the tree is dead.
Learn more about Mushrooms here:
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