Violet-toothed polypore

This is an image of Trichaptum biforme, a fungus that grows on hardwoods throughout the U.S. There is a closely related fungus called Trichaptum abietinum that grows on conifers. Distinguishing characteristics include the layer of algae that usually grows on the surface of the caps, and a lilac to violet colored pore layer. Rarely are specimens as photogenic as this one, especially on the top surface. Usually you will encounter this fungus as a rather homely mass of overlapping sporocarps that are dull cream color and covered by a thin layer of algae. Often the violet color is revealed only when you turn the sporocarp over and expose the pore layer. Pores are often daedaloid when the sporocarp is young, becoming poroid or toothed as they age. Unfortunately, the violet color also fades with the age of the sporocarp, but if you happen to see them when they are fresh and new, they often provide an unexpected flash of color in the woods.