Answer: Mushrooms appear under certain weather conditions from time to time. They are part of the natural cycle of decay and renewal in the soil. They are the fruiting body of a fungus growing underground. They are not damaging the grass, instead they feed on organic matter such as old dead tree roots underground or possibly, if this is a new lawn, organic matter such as wood shavings that were worked into the soil as an amendment. Once the material is broken down, the mushrooms will stop on their own. In the meantime you can rake them away if you don't like the look. Since they do harm, there is no recommended way to get rid of mushrooms in the lawn.
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