↑ Pegler D.(2001).“Useful fungi of the world: Amadou and Chaga”.Mycologist15(4): 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.""