White ball fungus with an egg-like center?

Puff ball mushroom. Edible and choice, when young like the one you found and cut in half. I like them sauteed in er. a href="http://images.search.yahoo.com/search/images?_adv_prop=image&fr=ush-ans&va=puffball+mushroom&sz=all"http://images.search.yahoo.com/search/im…/a