#cliff_brake__cliffbrake__rock_brake  any of several small lithophytic ferns of tropical and warm temperate regions
  supertype:  fern  any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores
  member of:  genus_Pellaea
  subtype:  coffee_fern__Pellaea_andromedifolia  evergreen fern of California and Baja California
  subtype:  purple_rock_brake__Pellaea_atropurpurea  very short shallowly creeping North American fern usually growing on cliffs or walls and having dark glossy leaf axes
  subtype:  bird's-foot_fern__Pellaea_mucronata__Pellaea_ornithopus  cliff brake of California and Baja California having purple-brown leafstalks

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