Amanita rhopalopus
An interesting characteristic of this mushroom is its deeply rooting basal
bulb.  Belongs to section
Lepidella in the Amanita genus. This mushroom
gives off an unpleasant scent.  Found in oak woods.

Compare to
Amanita ravenelii, a somewhat similar species.
48 hour time lapse.
Complete description at
Studies in the genus Amanita