- cliff brake, cliff-brake, rock brake - any of several small lithophytic ferns of tropical and warm temperate regions
--1 is a kind of fern
--1 is a member of Pellaea, genus Pellaea
--1 has particulars:coffee fern, Pellaea andromedifolia; purple rock brake, Pellaea atropurpurea; bird's-foot fern, Pellaea mucronata, Pellaea ornithopus