About Trametes gibbosa (Pers.) Fr.
Trametes gibbosa is a shelf-forming mushroom that can grow up to 20 centimeters wide. As its common name implies, its upper surface is uneven, lumpy, and velvety; the small hairs on this surface sometimes require magnification to be visible. When young, the upper surface is white or creamy in color; as it ages, it often develops grayer tones, and may also turn green from algae that settle into its surface hairs. The pore surface shares the same initial white or cream coloring, and also develops grayer tones with age. There are 1 to 3 pores per millimeter, and the pores are elongated; in atypical specimens, they can sometimes appear maze-like, or even resemble gills. The flesh has a woody texture and no distinct taste. The spore print, which can be difficult to obtain, is white. Spores measure 4–5.5 x 2–2.5 μm, and are elliptic to cylindrical, smooth, hyaline, and inamyloid. The species has a trimitic hyphal system with clamp connections. Trametes gibbosa is a saprobe that grows on dead hardwood. It is found in Eurasia and North America, specifically in the Pacific Northwest and east of the Great Plains, and can grow year-round.
