White fungi in grass

Mushrooms are the fruiting body (reproductive system) of fungus. Fungus is everywhere. Without it, we wouldn’t be able to survive. Amongst other things, fungus helps to break down old living materials and tissues, turning them into nutrients.
Just like all other living organisms, fungus needs to reproduce. Most plants create seeds that are sealed into the flowers or the fruit of the plant. Rather than seeds, fungus creates spores that are carried through the air or by animals to new areas. These spores are formed and stored in the gills of the mushrooms.