Boletellus russellii
Aureoboletus russellii, commonly known as Russell's bolete, is a species of bolete fungus in the family Boletaceae. An edible species, it is found in Asia and eastern North America, where it grows in a mycorrhizal association with oak, hemlock, and pine trees. Fruit bodies of the fungus are characterized by their coarsely shaggy stem. The yellow-brown to reddish-brown caps are initially velvety, but become cracked into patches with age. Taxonomy Originally named Boletus russellii by Charles Christopher Frost in 1878 from collections made in New England, the species was transferred to Boletellus by Edouard-Jean Gilbert in 1931. It was then transferred to Aureoboletus by Gang Wu and Zhu L. Yang in 2016. The specific epithet russellii honors American botanist and Unitarian minister John Lewis Russell, the first collector of the species. Common names given to the mushroom include shagnet, jagged-stem bolete, and Russell's bolete. Description The cap is hemispheric to convex or broadly convex, reaching a diameter of . The cap surface is initially velvety, with a margin rolled inward, but after maturing the cap becomes cracked and forms scale-like patches. The color is yellow-brown to reddish-brown to olive-gray, while the flesh is pale yellow to yellow. The pore surface