Why are fungus / mushrooms growing in my yard?
The previous answerer probably hit the nail on the head by saying you brought the fungus in, in the moss you planted. Considering the fact you are referring to these as weird fungus/mushroom type things I wonder if you don’t have a type of puffball mushroom growing since they often confuse people because they have no stem. As long as its not a stinkhorn which is very evident because it stinks to the high heavens and attracts carion eaters, then I would continue to just pluck the fungus from the moss carpet and the problem should be less next year as you are removing the spores and keeping them from reproducing. However I suggest you do some research and find out if this is a beneficial fungi. All plants are companions with some type of fungi. Fungi are nitrogen fixers and often aid in delivering nutrients from the soil to the plants. Mushrooms as well provide carbon dioxide to the plants they grow near. I would if I were you not worry so much about a sporadic outbreak of fungi as It is
