The Collaborative International Dictionary of English v.0.48:

cliffbrake \cliffbrake\ n.
   any of several small lithophytic ferns of tropical and warm
   temperate regions.

   Syn: cliff brake, rock brake.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

cliff-brake
    n 1: any of several small lithophytic ferns of tropical and warm
         temperate regions [syn: cliff brake, cliff-brake, rock
         brake]