BRIEF DESCRIPTION: The cap of A. subvirginiana is about 20 mm wide, convex to plane, without an umbo, somewhat viscid, with a striate margin (50% of the radius).  The cap is uniformly avellaneous.  The flesh is white and very thin.  Volval remnants are absent.

The gills are adnexed, subdistant to subcrowded, white, neither very broad nor very thin, and slightly ventricose.

The stem is about 40 x 3.5 - 4 mm, milk white, narrowing upward, dry, smooth, and hollow.  The saccate volva is white, narrow, and lobed.

The spores measure (9.0-) 10.2 - 14.0 (-15.5) x (6.2-) 7.8 - 10.2 (-11.8) µm and are broadly ellipsoid to ellipsoid and inamyloid.  Clamps are large and common at the bases of basidia.

Amanita subvirginiana was originally described from Florida (USA). It occurs in hammock vegetation (a term peculiar to Florida and indicating usually mesic, climax vegetation -- hardwood forest including Oak and Magnolia, etc.).