Pulveroboletus ravenelii

Pulveroboletus ravenelii, commonly known as Ravenel's bolete or the powdery sulfur bolete, is a species of bolete fungus in the family Boletaceae. It was described as new to science in 1853. The fruit bodies (mushrooms) have convex to flat, yellowish to brownish-red caps up to 10 cm (4 in) in diameter. On the cap underside, the pore surface is bright yellow before turning dingy yellow to grayish brown with age; it stains greenish blue then grayish brown after injury. A cottony and powdery partial veil remains as a ring on the stipe. The widely distributed species is known from Asia, Australia, and the Americas. Mycorrhizal with oak, it fruits on the ground singly, scattered, or in groups in woods. The mushrooms are edible, and have been used in traditional Chinese medicine and for mushroom dyeing....read more on Wikipedia.