Source : Webster's Revised Unabridged Dictionary (1913)

Boletus \Bo*le"tus\, n. [L. boletus, Gr. ?.] (Bot.)
   A genus of fungi having the under side of the pileus or cap
   composed of a multitude of fine separate tubes. A few are
   edible, and others very poisonous.

Source : WordNet®

Boletus
     n : type genus of Boletaceae; genus of soft early-decaying pore
         fungi; some poisonous and some edible [syn: {genus
         Boletus}]