On Quercus alba. This is a second observation of the same fungus showing a different stage than in the post at http://mushroomobserver.org/231456. The earlier observation was of one log section (Log Section 1) from two dates: 2015-04-03 and 2016-02-16. I went back with two friends on 2016-02-21 and photographed more of the Log Section 1 as well the adjacent section from the same tree (Log Section 2) in which the fungus was at a different stage than Log Section 1.