rock brake

World English Dictionary
rock brake
 
n
any of various ferns of the genera Pellaea and Cryptogramma, which grow on rocky ground and have sori at the ends of the veins

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WordNet
rock brake

noun
1. any of several small lithophytic ferns of tropical and warm temperate regions [syn: cliff brake
2. dwarf deciduous lithophytic ferns 
3. chiefly lithophytic or epiphytic fern of North America and east Asia [syn: rock polypody
WordNet® 3.0, © 2006 by Princeton University.
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