These little mushrooms are sprouting in armies all over Howarth Park. If there are trees they're there. I've seen them in grassland, as well. If you walk off the path you're forced to step on some! If you pick one and sniff it smells like bleach, which makes identification a bit more likely than if there was no smell. They're fruiting on the ground, not on wood, so that narrows it down even further.