Polyporus fomentarius

from The Collaborative International Dictionary of English v.0.48

Polyporus \Po*lyp"o*rus\, n.; pl. {Polypori}. [NL., fr. Gr.
   poly`s many + ? a pore.] (Bot.)
   A genus of fungi having the under surface full of minute
   pores; also, any fungus of this genus.
   [1913 Webster]

   Note: {Polyporus fomentarius} was formerly dried and cut in
         slices for tinder, called amadou. {Polyporus betulinus}
         is common in America, and forms very large thick white
         semicircular excrescences on birch trees. Several
         species of {Polyporous} are considered edible.
         [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Punk \Punk\, n. [Cf. {Spunk}.]
   1. Wood so decayed as to be dry, crumbly, and useful for
      tinder; touchwood.
      [1913 Webster]

   2. A fungus ({Polyporus fomentarius}, etc.) sometimes dried
      for tinder; agaric.
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   3. An artificial tinder. See {Amadou}, and {Spunk}.
      [1913 Webster]

   4. A prostitute; a strumpet. [Obsoles.] --Shak.
      [1913 Webster]