The Collaborative International Dictionary of English v.0.48:

Boletic \Bo*let"ic\, a. (Chem.)
   Pertaining to, or obtained from, the Boletus.
   [1913 Webster]

   Boletic acid, an acid obtained from the Boletus
      fomentarius, variety pseudo-igniarius. Same as Fumaric
      acid.
      [1913 Webster]