They could be any of a number of different mushrooms. Are they coming
up at random, in clumps, or in a ring? What colour are the gills?
Don't be tempted to eat them - some of the lawn fungi are very
poisonous.

I thought that this was going to be a fairy circle question, we have
had them before and some of the men say that they would stand in the
middle and wish for Charlie Dimmock, is she still a favourite I
wonder :-)
kate