| pellaea | (n) genus of chiefly small rock-loving ferns; in some classification systems it is placed in the family Polypodiaceae or Adiantaceae, Syn. genus Pellaea |
| bird's-foot fern | (n) cliff brake of California and Baja California having purple-brown leafstalks, Syn. Pellaea mucronata, Pellaea ornithopus |
| button fern | (n) fern of New Zealand and Australia having trailing fronds with dark green buttonlike leaflets, Syn. Pellaea rotundifolia |
| coffee fern | (n) evergreen fern of California and Baja California, Syn. Pellaea andromedifolia |
| purple rock brake | (n) very short shallowly creeping North American fern usually growing on cliffs or walls and having dark glossy leaf axes, Syn. Pellaea atropurpurea |