paltonium

from The Century Dictionary.

• noun A genus of polypodiaceous ferns related to Tænitis, having simple, linear-lanceolate, coriaceous fronds a foot or less long, tapering both ways, with anastomosing veins and sori normally borne in a conspicuous submarginal line toward the apex. There are two species, the best known, P. lanceolatum (Tænitis lanceolata), being an epiphyte of tropical America and southern Florida; the second, a recently described Chinese plant.