Earth ball, Scleroderma (fungus). Was cycling through the woods today, and came across this round fungi on a strip full of them. Thought that it was a truffle, but it turned out that it wasn’t. The web is so amazing that these days, with search terms close enough you are likely to get the search results you desired. Thus given the time, and in regards to simple stuff, there shouldn’t be any excuse anymore to say ‘I don’t know’, instead, one should say ‘I’ll google it’. By the way, to know more about this fungi-earth ball, here is the link http://en.wikipedia.org/wiki/Earth_ball.