The color of the cap and the color of the secondary veil, as well as the large marginated bulb at the base of its stipe, make it possible to identify it for sure.
The cap is gray, darker in the center, bald or adorned with whitish to brownish gray velar flakes.
Stipe largely bulbous-marginated sometimes longitudinaly « chiseled ». With a fairly persistant skirtlike white or pale yellow ring.
The cap color of citron amanita varies widely, ranging from greenish (a color that fades with age) or dark gray to white in the white variety. This is why it is described in three different places to help the amateurs to identified them: 3.2 for fruitbodies with a greenish cap, 5.8 for the white variety and 7.3 for fruitbodies with a gray to brownish gray cap.
For more informations