Fungi are the third kingdom of eukaryotes along with plants (Plantae) and animals (Animalia). Fungi are acutally more closely related to animals than to plants although they are commonly grouped with plants. Like animals, Fungi are heterotrophic meaning they cannot produce their own food and must get nutrients from other sources. To do this, Fungi use absorptive nutrition meaning they secrete enzymes into their immediate environment, dissolve organic matter, and then reabsorb the dissolved nutrients. Like plants though, Fungi are not mobile (for the most part). Instead growth is how they move and reach new areas with nutrients. A good example of this are fairy rings (see image below).

All the mushrooms you see here are part of the sample individual. The mushrooms you see are similar to a flower or fruit of plants. They are only the reproductive part of Fungi. The body of the fungus is actually invisible unless you dig it up. The bulk of fungi are made up of hyphae (singular hypha) which group together to make mycelium. Fungi will grow in a circle like this because it is the most efficient way to access all the nutrients in their immediate area. The mushrooms here represent the outside edge of the body of the fungus.