BRIEF DESCRIPTION: The cap of A. tanzanica is 50 - 110 mm wide, first convex, becoming flat, silky, sticky, smooth, with a striate margin.  The cap is bright orange to dark orange, becoming paler and having more of an ochre tint with age.  The flesh is fairly firm.  The volva is seldom present and then with one or a few big patches of white remnants.

The gills are free, white, fairly crowded, thin, with a smooth margin.

The stem is 80 - 130 x 5 - 20 mm, white, with a finely striate ring above, and slightly floccose below. The flesh is white, brittle fibrous, and later hollow. The saccate volva is attached at the extreme point of the stem, white to dirty white, big, lobed, and thick.

The spores from an isotype measure (8.5-) 9.0 - 11.4 (-12.6) x (5.0-) 5.5 - 6.7 (-7.8) µm, and are elongate to ellipsoid, infrequently cylindric, and inamyloid.  Clamps are occasional or not frequent at the bases of basidia ("mostly without, but occasionally with, clamps" according to the original description).  Lack of clamps is very unusual in sect. Caesareae, and the material should be re-examined.

The species was originally described from miombo woodland in Tanzania.  Some associated plant genera are listed: Albizia, Brachystegia, Diospyros, Diplorhynchus, Pterocarpus, and Xeroderris.