Climbing Fern Family. Plants with erect, simple, pinnate or dichotomous, or vine-like, twining, elongate leaves, with stalked, alternate, paired and mostly palmately lobed or pinnate leafy divisions. Sporanges borne in double rows on narrow specialized lobes or segments, obovoid, pyriform or globose, sessile, provided with a transverse apical ring and opening vertically by a longitudinal slit.