BRIEF DESCRIPTION: This description is taken from the original description of Bas (1978).

The cap of A. crebresulcata is 50 - 75 mm wide, glabrous, campanulate with a rather acute umbo in young specimens, plano-convex to flat or plano-convace with low obtuse umbo in older specimens, with a broad, densely sulcate-striate margin (45 - 65% of the radius). The cap is dark umber to fuscous-sepia at the umbo and somewhat paler away from the umbo.

The gills are free, crowded, narrow, and white. The short gills are truncate and rather scarce.

The stem is up to 120 x 10 mm, tapering upward, hollow, without a bulb, gray, white at the base, often paler at the apex, glabrous, smooth, and exannulate. The saccate volva is membranous, thin, narrowly sheathing, white to cream, and minutely felted.

The spores from the original material measured (8.0-) 8.5 - 10.5 (-11.0) x (6.5-) 7.0 - 8.5 (-9.0) µm and are subglobose to broadly ellipsoid (rarely ellipsoid) and inamyloid. Clamps are absent at the bases of basidia.

This species belong to a small group described in the discussion of A. dunicola Guzmán.