If you mow your lawn this is the result of the natural breakdown of your grass clippings. It is a harmless process and there is absolutely nothing wrong with your lawn.

I get them too......no harm done. It can be dead roots from trees that can spread out quite a distance that do it.

Not all mushrooms grow on the same substrate. Some grow on decaying wood, some on animal droppings, or grass roots , pine needles etc. so its hard to say what they are growing on. They don't matter at all and will soon disappear, though they may return next autumn.

Thankyou all for your advice obviously no need to worry