http://pluto.njcc.com/~ret/amanita/species/elongata.html
“This species can usually be easily distinguished in the field from its probable close relative Amanita flavoconia G. F. Atk. var. flavoconia because of its white stem and its often nearly pure yellow cap. The stem, however, may infrequently have a pale yellow region above the annulus; and the cap may infrequently have an irregular small area of orange near the center or even be as strongly orange-yellow as in the picture on the right, above.”

Amanita elongata Peck looks like A. flavoconia, with the following differences-an entirely yellow (or almost entirely yellow with a “random” orange blotch) cap, a stem that is entirely white (or has some yellow), spores that are narrower than those of A. flavoconia, etc. See the page for A. elongata on the Amanita studies site.

Rod

I’d bet this is just another beautiful Amanita flavoconia whose scales have been washed off. Did it have a volva? It sure doesn’t look like a Lepiota lutea (whatever that species is called these days).