(derivation obscure). Polgpodidcue. Greenhouse ferns. Includes plants of great diversl of foliage, which are often referred to many genera. ori spread in a layer over the entire under surface of the leaf or of certain of the upper pinnaa, rarely over both surfaces. Foliage rather coarse, the leaves simple or plnnate, rarely forked. All the 140 species are plants of tropical regions, two species growing in S. Fla. Some kinds are adapted to covering walls, columns, trunks of tree ferns, etc. The kinds with long fronds are excellent for hanging baskets. As all kinds require an abundance of water at the roots, the compost should be very porous.