Haplopteris

Haplopteris is a genus of vittarioid ferns, a member of subfamily Vittarioideae and family Pteridaceae.

==Description== Like other vittarioids, the members of Haplopteris are epiphytes. The rhizome has a distinct upper and lower side, lacking radial symmetry, a characteristic that separates it from Radiovittaria. Leaves are borne in two ranks in a single plane, and are usually simple, occasionally forked. The leaves have a distinct costa (midrib). Most species have netlike leaf veins which form two rows of areolae (the "gaps" in the net) on either side of the midline; two species bear a single leaf vein only. The linear sori, in most species, are confined to a commissural vein (paralleling the edge of the leaf margin and set just back from it, joining the ends of the netted veins); in the two species with a single vein, the sori follow that vein. The sori bear paraphyses (minute hairs) with a cell at the tip shaped like an inverted cone, separating it from Vittaria sensu stricto, with slender paraphyses.