Pegler, D.«Useful fungi of the world: Amadou and Chaga».Mycologist,15,4,2001,p.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.»