rock brake

World English Dictionary
rock brake
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 & Unabridged 10th Edition
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rock brake

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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