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Rock Brake| Noun | 1. | rock brake - any of several small lithophytic ferns of tropical and warm temperate regionsfern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores genus Pellaea, Pellaea - genus of chiefly small rock-loving ferns; in some classification systems it is placed in the family Polypodiaceae or Adiantaceae | | | 2. | rock brake - dwarf deciduous lithophytic fernsfern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores | | | 3. | rock brake - chiefly lithophytic or epiphytic fern of North America and east Asiapolypody - any of numerous ferns of the genus Polypodium | |
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