Summer rain creates favorable growth circumstances for fungus, certainly, and there are a gazillion varieties so naming it probably isn't possible. But let me ask you a couple of questions.
Where are you? Are you an organic gardener? What have you put down on the soil in the last couple of years? What kind of mulch is that (and where did it come from).
And the most important clue to answer this question, was there a tree on this spot or very nearby any time in say the last 10 years? If a tree died and the top was removed, even if the stump was ground, there is a vast network of woody roots that break down over time and often fungus will appear on the surface above that root system. This is the fruiting body of the fungus that is much larger and involved with the decaying roots below.
_________________ Northwesterner
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