 The convex cap measures 30 – 80 mm (1.2 – 3.1 in) in diameter. Slightly sticky when wet, the cap surface is shiny and smooth. Sometimes, the surface has flattened filaments (formed from aggregated hyphae), and may develop cracks. The thin and easily detached cap cuticle is initially reddish brown to dark brown, later becoming cinnamon brown. The cap margin is curved inward when young, but becomes bent downward when mature. The white to very pale yellow cap flesh does not change color when exposed to air, and has a pleasant odor and mild taste. The tubes comprising the hymenophore on the underside of the cap measure 3 – 8 mm (0.1 – 0.3 in) long and are pale yellow initially before developing a greenish tinge in age. The pore surface does not stain when it is bruised. The pores are roughly spherical or polyhedral at first, becoming angular to pentagonal in age, and almost gill-like near the attachment to the stem. Pores are about 1 – 2 mm in diameter. The stem is solid (i.e., not hollow) 3 – 5 cm (1.2 – 2.0 in) long, 10 – 15 mm (0.4 – 0.6 in) thick in the upper part, expanding to 2 – 2.5 cm (0.8 – 1.0 in) at the bulbous base. It has pseudorrhiza (cord-like structures resembling a plant root) that are 0.5 – 1.5 cm (0.2 – 0.6 in) long. The stem surface is dry and smooth except for a powdery region near the apex. The top of the stem is yellow, but it gradually becomes reddish approaching the bulbous base. The stem tissue is pale yellow, although tunnels dug by insect larvae are reddish brown.
