At Swansea justice court one can see Coprinellus disseminatus (=Coprinus disseminatus) Fairy Inkcaps. They appear on mass then disintegrate, often within 24 hours..but they pulse outwards with vigour over many days so whilst many die away many sprout up in their wake, moving outwards like a ripple on a pond.
They don't last long. If you see them they are wonderful because they can cover huge areas. I was surprised to see them but it was worth it. By the time you read this they might most probably have all gone..
In the photo below, are new fruiting bodies and behind the decaying.