The mold that grows on bread would be a decomposer. The reason why it would be a decomposer is because when the bread starts molding, it decomposes to get energy from it. The mold in the bread would be a fungi growing on the bread, and fungi decomposes. It wouldn't be a producer because the molds do not produce anything. It would also not be a consumer because it's not consuming anything to make it any better.
