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

genus Lygodium, Lygodium - chiefly tropical climbing ferns

creeping fern, Hartford fern, Lygodium palmatum - delicate fern of the eastern United States having a twining stem and palmately-lobed sterile fronds and forked fertile fronds

climbing maidenhair, climbing maidenhair fern, Lygodium microphyllum, snake fern - tropical fern widespread in Old World; naturalized in Jamaica and Florida