tan sombrero toadstool

I love your common name for this one. :) The 'hump' shape on the top is called an 'umbo' This is a good example of why you need under shots though. That ring around the stem half way down is important and suggests there is a lot more information to be found under the cap and near the base. It would be an interesting species because most of this type have crusty tops. It is probably some type of agaricus but that's a big family.