Fall Brown Polypore (Polyporus badius, Royoporus badius or Picipes badius)
- Similar Species
- Preserving (Drying or Freezing)
- Recipe Suggestions
Old Leathery Specimens:
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 25 cm (9.8 in), and a stipe that is often completely black or brown at the top and black at the base.
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 5–25 cm (2.0–9.8 in) across by 1–4 mm (0.04–0.16 in) 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). The stipe, attached to the cap either centrally or laterally, is 2–8 cm (0.8–3.1 in) long by 0.5–1.5 cm (0.2–0.6 in) thick, velvety and dark brown to blackish-brown, black and longitudinally wrinkled when old. Fruit bodies are inedible because of their tough texture.
The spores are ellipsoid or cylindrical, hyaline (translucent), smooth, and 7.5–9 by 3–5 µm. The basidia (spore-bearing cells) are club-shaped with a narrow base, and have dimensions of 20–30 by 7–9 µm. Like other members of the genus Polyporus, this species has a dimitic hyphal construction, meaning that the hyphae are made of both generative hyphae and skeleto-ligative hyphae, a feature which tends to make the mushroom tissue hard and woody. There are no cystidia in the hymenium. The fungus has been shown to produce asexual spores when grown in pure culture conditions.
Royoporus badius is a saprobic species, and causes white rot. It grows on the standing or fallen trunks and branches of various hardwood genera, including Acer, Aesculus, Alnus, Betula, Castanea, Fagus, Fraxinus, Populus, Prunus, Robinia, Quercus, Salix, Tilia and Ulmus. The fungus grows in temperate regions of Asia, Europe, and North America.