I once saw a whole field of (damp) cereal stubble with thousands of these. These are up to ca 10cm diameter.

The red one is a Blackening Waxcap.

Olympus EM-1, (aperture priority), Olympus 4/3 50mm f2 macro, f11, hand-held.

_B090580_DxO Stubble Rosegill Volvopluteus gloiocephalus Crosseye Topaz 1600.jpg