| NOUN | plant | cliff brake, cliff-brake, rock brake | any of several small lithophytic ferns of tropical and warm temperate regions |
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| Meaning | Any of several small lithophytic ferns of tropical and warm temperate regions. | |
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| Synonyms | cliff-brake, rock brake | |
| Member of | Pellaea, genus Pellaea | genus of chiefly small rock-loving ferns |
| Narrower | bird's-foot fern, Pellaea mucronata, Pellaea ornithopus | cliff brake of California and Baja California having purple-brown leafstalks |
| coffee fern, Pellaea andromedifolia | evergreen fern of California and Baja California | |
| purple rock brake, Pellaea atropurpurea | Very short shallowly creeping North American fern usually growing on cliffs or walls and having dark glossy leaf axes | |
| Broader | fern | Any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward |
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