Dune 'Shroom

I guess many of us tend to associate fungi with the damper days of Autumn. Therefore, I was slightly surprised to see a small number of these little mushrooms (I'm guessing they were no more than three or four inches tall) scattered amongst the arid sand dunes of Swansea Beach on my walk there the other day. I have no idea what species they are, but decided they might make a decent picture, and so I attached an extension tube to my 70-200mm lens, and lay down to get a couple of low-angled shots:

If anyone knows their identity, I'd be pleased to know!