small amounts of the polyphenol compound atromentin. Hydnuferrigin has a chemical structure that closely resembles that of thelephoric acid, a pigment found in other species of Hydnellum and Hydnum, and they may originate from a common precursor compound. References Cited works External links Inedible fungi Fungi described in 1815 Fungi of Africa Fungi of Asia Fungi of Europe Fungi of North America ferrugineum Taxa named by Elias Magnus Fries