BRIEF DESCRIPTION: The fruiting body of A. subjunquillea var. alba is small to medium-sized. The cap is (20-) 30 - 100 mm wide, first hemispherical, then convex to plano-convex to applanate, white to whitish, sometimes pale cream-colored to pale yellowish in the center, subviscid, glabrous and usually without volval remnants. The margin is smooth or sometimes finely striate and non-appendiculate, and the flesh is white to whitish.

The gills are free and crowded, and the short gills are attenuate.

The stem is 50 - 145 x 3 - 20 mm, subcylindrical or slightly tapering upward, white to whitish, smooth or with white fibrils or reflexed squamules. The stem's basal bulb is subglobose and 7 - 20 (-30) mm wide. The volva on the stipe base is limbate, membranous, sometimes leathery, with free limb up to 15 mm in height and 4 mm thick; both surfaces are white to whitish. An annulus is present; it is superior, white, and membranous or friable.

The spores measure (6.0-) 6.5 - 9.0 (-10.5) x (5.5-) 6.0 - 8.5 (-10.0) µm and are globose to subglobose and amyloid.

The fresh basidiocarps of A. subjunquillea var. alba give a yellow reaction to 5% KOH solution (see photograph, above).

Amanita subjunquillea var. alba is deadly POISON.

It appears similar to A. virosa (Fr.) Bertillon in DeChambre and is, perhaps, more closely related (note the cap is not irregularly shaped) to A. bisporigera G. F. Atk.  One may also wish to compare A. exitialis Zhu L. Yang & T. H. Li.  There is no close relation to A. gemmata (Fr.) Bertillon in Dechambre (=A. jonquillea Quél.) -- a species of Amanita section Amanita.

This taxon was originally described from southwestern China. It is widely distributed in China and Japan and is also known from northern India. -- Zhu L. Yang and R. E. Tulloss