Common Brown Cup
Peziza badio-confusa or more correctly
Peziza phyllogena according to Bill Neill and Karen Hansen of Farlow Herbarium

Here is a picture of the largest one I found.  It is 5" in diameter.  Cobwebs show up in picture.

Here is a side view of the one above.

Sun shining through it.  It is shown growing out of a rotten piece of wood that was underground.

Here is a younger specimen that has the cup shape.  About 2.5" diameter.

Here is a group of them.  The largest about 2" diameter.