The Collaborative International Dictionary of English v.0.48:

old-man-of-the-woods \old-man-of-the-woods\ n.
   An edible mild-tasting mushroom (Strobilomyces floccopus)
   found in coniferous woodlands of eastern North America.

   Syn: old man of the woods, Strobilomyces floccopus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

old-man-of-the-woods
    n 1: edible mild-tasting mushroom found in coniferous woodlands
         of eastern North America [syn: old-man-of-the-woods,
         Strobilomyces floccopus]