rock brake

noun

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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Examples from the Web for rock brake

  • On the same cliff were tufts of the alpine woodsia and dense patches of rock-brake—but these stand in no need of the bee.

    In the Open|Stanton Davis Kirkham