The Collaborative International Dictionary of English v.0.48:

Lygodium \Ly*go"di*um\, n. [NL., fr. Gr. ? flexible; ? a willow
   twig + e'i^dos form.] (Bot.)
   A genus of ferns with twining or climbing fronds, bearing
   stalked and variously-lobed divisions in pairs.
   [1913 Webster]

   Note: Lygodium palmatum, much prized for indoor ornament,
         inhabits shaded and moist grassy places, from
         Massachusetts to Virginia and Kentucky, and sparingly
         southwards.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Lygodium
    n 1: chiefly tropical climbing ferns [syn: Lygodium, genus
         Lygodium]