Source : Webster's Revised Unabridged Dictionary (1913)

Podetium \Po*de"ti*um\, n.; pl. {Podetia}, E. {Podetiums}. [NL.,
   fr. Gr. ?, ?, foot.] (Bot.)
   A stalk which bears the fructification in some lichens, as in
   the so-called reindeer moss.

Source : WordNet®

podetium
     n : an organ or body resembling a stalk; especially the
         outgrowth of the thallus of certain lichens on which the
         ascocarp is borne
     [also: {podetia} (pl)]