The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster] Boley

WordNet (r) 3.0 (2006):

Boletus
    n 1: type genus of Boletaceae; genus of soft early-decaying pore
         fungi; some poisonous and some edible [syn: Boletus,
         genus Boletus]