fern - any of numerous flowerless and seedless vascular plants having true roots from a rhizome and fronds that uncurl upward; reproduce by spores

genus Pellaea, Pellaea - genus of chiefly small rock-loving ferns; in some classification systems it is placed in the family Polypodiaceae or Adiantaceae

coffee fern, Pellaea andromedifolia - evergreen fern of California and Baja California

Pellaea atropurpurea, purple rock brake - very short shallowly creeping North American fern usually growing on cliffs or walls and having dark glossy leaf axes

bird's-foot fern, Pellaea mucronata, Pellaea ornithopus - cliff brake of California and Baja California having purple-brown leafstalks