Pegler, D. «Useful fungi of the world: Amadou and Chaga». Mycologist, 15, 4, 2001, pàg. 153–154. DOI: 10.1016/S0269-915X(01)80004-5. «In Germany, this soft, pliable 'felt' has been harvested for many years for a secondary function, namely in the manufacture of hats, dress adornments and purses.»