Royoporus badius  Royoporus badius or Picipes badius, commonly known as the black-footed polypore or black-leg, is a species of fungus in the family Polyporaceae. It causes a white rot of hardwoods and conifers. The species is found in temperate areas of Asia, Australia, Europe, and North America. It has a dark brown or reddish-brown cap that reaches a diameter of , and a stipe that is often completely black or brown at the top and black at the base. The species was first described in the scientific literature in 1801 by Christian Hendrik Persoon, who named it "Boletus badius". American mycologist Lewis David de Schweinitz transferred the species to "Polyporus" in 1832, and it was known by this name until 1997, when De transferred the species into the genus "Royoporus", which he had described the year before. Polyporaceae species that are closely phylogenetically related to "R. badius" include "P. dictyopus", "P. melanopus", and "P. tubaeformis", which have clamp connections on generative hyphae and a similar ecology. Zmitrovich & Kovalenko proposed the new genus "Picipes" for this fungus together with "P. melanopus" and "P. tubaeformis" and according to Species Fungorum "Picipes badius" is now the correct current name. The specific epithet "badius" derives from the Latin root "badi-", meaning "reddish brown". The common names "black-footed polypore" and "black-leg" refer to its characteristic dark-colored stipe. The fruit bodies of "Royoporus badius" tend to be upright, growing solitary or in groups, sometimes with two or more fruit bodies arising from a common stipe. The cap is circular or kidney-shaped, and often lobed or with a wavy edge. When young, the fruit bodies are convex, then become flat or funnel-shaped in maturity, reaching dimensions of across by thick. The upper cap surface is smooth and glossy, but develops radial wrinkles as it ages. The color of the cap is brown, often darker in the center and lighter-colored at the margins. The under-surface is white or cream-colored, yellowing when old. Pores are round and number 6–8 per mm, with decurrent tubes (running down the length of the stipe).