Source : Webster's Revised Unabridged Dictionary (1913)

Hart-tongue \Hart"-tongue`\, n. (Bot.)
      (a) A common British fern ({Scolopendrium vulgare}), rare
          in America.
      (b) A West Indian fern, the {Polypodium Phyllitidis} of
          Linn[ae]us. It is also found in Florida.