A very small bolete that is cinnamon-brown throughout, except for the chrome-yellow stem flesh; it does not stain blue on bruising. The slightly greasy cap is convex in shape, and the stem is slender; the tubes are 0.3-1 cm long. The flesh has an intensely hot and peppery flavor, making this species inedible, although is has been used as spice. Cap
tubes are adnate to decurrent. Pores are angular cinnamon to rust brown. Spores
are susty brown.
Chalciporus piparatoides it similar but can be distinguished by the blue bruising of its cap, tubes, and pores. Chalciporus amarellus has pinker coloring and a less peppery taste.
on the MushroomExpert.Com Web site.