Identify this fungus

[Prometheus]

Every year between January - March our front and back garden erupts with these globe fungus. They’re a brown ball that open and (I assume) release spores. They literally appear overnight. Some years I try to dig them out and they leave a big hole in the ground. Some are small (2cm diameter) and some grow to around 6cm diameter). I get around 40 in total on my relatively small lawns. I’ve asked a few different professional gardeners and groundskeepers and they have no idea what it is. I’m assuming I can’t can’t do anything about them as fungus grow via underground networks but does anyone know what they are and have advice about how to eradicate them please?

I'm no mycologist but...there's a type of fungus called an earth star which might fit the bill. I do think digging will help get rid. The fruiting body is just the above ground bit. They'll be a network of fungal threads (mycelium) in the soil. They can be very beneficial to plant roots, help them absorb nutrients. If you wished to eradicate them, you could try dousing the soil with a fungicide (assuming there's a suitable product on the market) or change the soil environment (make it wetter/dryer, more acid/alkali) so it is no longer a suitable habitat for that species.

I think it could be a lot of trouble and, potentially, expense to go to for something that's probably harmless and possibly beneficial.

Anything you do might have other unintended consequences to the detriment of the rest of your garden.

Looks like a cup fungus.

An earth star has a spherical spore bearing body with an outer covering that peels back in segments, so the central body is surrounded by elongated triangular rays, like a drawing of the sun, hence the name earth star.