Many types of fungi can grow on your lawn and ruin its appearance. These include mould, moss and black mushrooms. These types of fungi can cover plants in your yard and can eventually kill them by blocking out light and suffocating the plant. They can also actually decay the plants by eating them away. Use an anti-fungal that will work with the type of plants and grass in your lawn so that you don't damage it.
Put on gloves and remove as many mushrooms as possible. If they are large you will be able to remove most of them, but some might be too small to pick up.
Mix a commercial anti-fungal spray with water. Use the proper ratio according to the manufacturer's instructions.
Pour the solution into a pump sprayer.
Spray the anti-fungal solution onto the entire lawn and over the mould, moss and black mushrooms. Let it sit for several days before reapplying it. Repeat this process every few days until the mould, moss and mushrooms are gone.
Repeat the process with a moss killer if the first solution did not kill the moss. Some mould killers will kill moss as well while others will not.