rock brake
n 1: any of several small lithophytic ferns of tropical and warm
temperate regions [syn: {cliff brake}, {cliff-brake}, {rock
brake}]
2: dwarf deciduous lithophytic ferns
3: chiefly lithophytic or epiphytic fern of North America and
east Asia [syn: {rock polypody}, {rock brake}, {American wall
fern}, {Polypodium virgianum}]