BRIEF DESCRIPTION: The cap of A. miculifera is 70 - 120 mm wide, conical with an obtuse apex to plano-conical, probably subviscid, with inflexed, nonsulcate, appendiculate margin.  The cap is pearl gray.  The volva is present as small and low subpyramidal warts, towards the margin as small moderately dark gray volval crumbs or thin, subfelted-subfloccose disintegrating patches.

The gills are free, crowded, rather narrow, and whitish or white.  The short gills are very gradually attenuate.

The stem is 140 - 240 x 15 - 25 mm, grayish-whitish to pale gray, subcylindrical, and probably solid.  On the lower stipe there is a white to pale gray layer of somewhat felted to somewhat finely hairy material.  There is a dense region of cottony-floccose material at the top of the stipe (which is, otherwise, exannulate).  The volval remnants on the lower stem and bulb are described by Bas and Hatanaka as scattered, inconspicuous, floccose-felted fragments "provoking formation of small recurving scales on [the] upper part of the bulb.

The spores measure (9.0-) 10.0 - 12.5 (-13.5) x (6.0-) 6.5 - 8.0 µm and are amyloid and broadly ellipsoid to ellipsoid to oblong-ellipsoid.  Clamps are distinct at bases of basidia.

This species was originally described from Japan (Nagano Prefecture, Honshu).

For comparison, see Amanita onusta (Howe) Sacc., and Amanita gracilior Bas ex Bas & Honrubia.  The present species was assigned to Bas' stirps Virgineoides by its authors.  For information about the members of this stirps, see the discussion of A. virgineoides Bas. -- R. E. Tulloss