Rhizome climbing or creeping
growing end only covered with imbricating round peltate brown scales, radially
symmetrical, and indefinitely up to 40 in long. Stipe remote, vascular system
in a complex arrangement. Frond simply pinnate, dimorphous. Sterile fronds are
elliptical, edges are shaply toothed. Fertile fronds are linear, lower surface
covered with sporangia. Veins forming a single series of long narrow areoles
close to the costa, otherwise free, without main veins, a gland present on the
edge of each pinnae close to the base.