lichenic acid

from The Collaborative International Dictionary of English v.0.48

Fumaric \Fu*mar"ic\, a. (Chem.)
   Pertaining to, or derived from, fumitory ({Fumaria
   officinalis}).
   [1913 Webster]

   {Fumaric acid} (Chem.), a widely occurring organic acid,
      extracted from fumitory as a white crystallline substance,
      {C2H2(CO2H)2}, and produced artificially in many ways, as
      by the distillation of malic acid; boletic acid. It is
      found also in the lichen, Iceland moss, and hence was also
      called {lichenic acid}.
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Lichenic \Li*chen"ic\ (l[-i]*k[e^]n"[i^]k), a.
   Of, pertaining to, or obtained from, lichens.
   [1913 Webster]

   {Lichenic acid}.
   (a) An organic acid, {C14H24O3}, obtained from Iceland moss.
   (b) An old name of fumaric acid.
       [1913 Webster]