Climbing ferns. Rhizome long, winding, branched, fleshy; rhizome scales narrow to very broad, dark. Stipe not articulated. Fronds dimorphous, pinnate, with articulated pinnae, except for the terminal one. Sterila pinnae oblong to narrowly lanceolate, fertile pinnae narrowly linear and underside covered entirely with sporangia. Rhachises glabrous or scaly. Veins simple or forked, parallel, free, ending in or near the margin.