Fungi consist of lots of threads that lie under the ground. Whenever these threads come to the surface, they form a fruit. Some of these are edible, others are poisonous!
Mushrooms are fungi with a white top. In the wild, they grow in the woods, but they can also be grown specially in cool, dark, moist places. Mushrooms need to be eaten soon after purchase, because they deteriorate quickly.
Oyster mushrooms get their name from the fact that they are very similar in shape to an oyster. Their caps vary from light brown to light grey. Just like other mushrooms, they grow in the woods, during the autumn and winter. But in special cells, they can be harvested all year round.
There are lots of other different kinds of mushrooms: eryngii, wood blewitt, elm oysters and so on.