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A polypore mushroom of the genus Fomitopsis. An alternative binomial name is Fomes pinicola. Cap hoof-shaped or triangular, hard and tough texture, up to 30-40 x 25 x 10 cm. Surface is more or less smooth, at first orange-yellow with a white margin, later dark reddish to brown and then frequently with orange margin. Pore surface pale yellow to leather-brown, 3-4 pores per mm. The fruiting body of Fomitopsis pinicola is called the conk. It is a woody, pileate fruiting body with pores lined with basidia on its underside. As in other polypores, the fruiting body is perennial with a new layer of pores produced each year on the bottom of the old pores.
The species is common throughout the temperate Northern hemisphere. Grows on live and dead coniferous or (less common) deciduous trees.
This mushroom is inedible due to its woody texture, but it is useful as tinder.