rock brake
Also found in: Thesaurus, Wikipedia.
rock brake
n
(Plants) any of various ferns of the genera Pellaea and Cryptogramma, which grow on rocky ground and have sori at the ends of the veins
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
ThesaurusAntonymsRelated WordsSynonymsLegend:
Switch to new thesaurus
| 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 coffee fern, Pellaea andromedifolia - evergreen fern of California and Baja California Pellaea atropurpurea, purple rock brake - very short shallowly creeping North American fern usually growing on cliffs or walls and having dark glossy leaf axes bird's-foot fern, Pellaea mucronata, Pellaea ornithopus - cliff brake of California and Baja California having purple-brown leafstalks |
| 2. | rock brake - dwarf deciduous lithophytic ferns fern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores Cryptogramma, genus Cryptogramma - sometimes placed in family Polypodiaceae or Cryptogrammataceae American parsley fern, American rock brake, Cryptogramma acrostichoides - rock-inhabiting fern of northern North America growing in massive tufts and having fronds resembling parsley Cryptogramma crispa, European parsley fern, mountain parsley fern - fern of Europe and Asia Minor having short slender rhizome and densely tufted bright green fronds resembling parsley | |
| 3. |  rock brake - chiefly lithophytic or epiphytic fern of North America and east Asiapolypody - any of numerous ferns of the genus Polypodium |
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.