Source : Webster's Revised Unabridged Dictionary (1913)

Phytologist \Phy*tol"o*gist\, n.
   One skilled in phytology; a writer on plants; a botanist.
   --Evelyn.

Source : WordNet®

phytologist
     n : a biologist specializing in the study of plants [syn: {botanist},
          {plant scientist}]