Earth was covered by giant mushrooms before trees overtook the land.
The mushroom is a very nutritious food. Differing species can be a good source of vitamin B along with essential minerals such as copper and potassium. While fat, carbohydrates and salt content is very low.
There are a few mushroom varieties found in the wild that are highly poisonous. A number of these look like common edible species, therefore it can be risky collecting them.