Unidentified Fungus #2

I spotted specimens of this mushroom on July 9, 2014, and also in January 2017. In 2017, I found it near the trunk of my southern live oak in the front yard. 

In 2014, I only saw this early stage of the mushroom, so I wondered if it was some kind of puffball.

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Here are some open caps on stalks on January 19, 2017
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At one point, I was convinced it was Leucocoprinus birnbaumii, but the gills on that musroom are quite different.
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