What eats fungus?

Leaf-cutter ants, believe it or not, do not eat leaves. They gather fragments of leaves and deposit them in "gardens" in their nests. There, fungus grows on the leaves and THAT is what the ants eat. Also, mushrooms are a type of fungus. So if you eat mushrooms, YOU eat fungus!

Similarly, certain fungi can sometimes eat other fungi. An atypical example is the parasitic ascomycete, Hypomyces lactifluorum, which infects a host mushroom (fruiting body of a fungus). This specific combination, Hypomyces lactifluorum + (typically) Russula brevipes or Lactarius piperatus, is known as a single entity, the Lobster Mushroom. The cool part is that this parasite turns an almost inedible mushroom (Lactarius piperatus) into a culinary delight! By itself, this mushroom is described as acrid, hot, peppery, and unpleasant to taste, sometimes causing mild poisonings, but once thoroughly infected with Hypomyces lactifluorum, it becomes not only delicious, but also non-poisonous.