Gyroporus castaneus (Bulliard) Quélet is a bolete commonly found in North America, and in Michigan in hardwood forests. It’s called the “chestnut bolete” because of the chestnut brown color of the cap, but is white just below the surface. The pore surface is a pale yellow and does not change colors when bruised or cut. The stipe is hollow and the pores nearly attach to the stipe, with only a small margin between the pores and the stipe. The spore print is a bright yellow, consisting of small, oval, hyaline spores.
Kuo, M. (2013, December). Gyroporus castaneus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/gyroporus_castaneus.html