Slender vine, glabrous throughout; stems slender. Leaves opposite, deeply palmate, with 3-7 lobes (fertile leaves usually 3-5-lobed); petioles slender, mostly 2.5-5.5 cm long; lobes long and narrow, acute to acuminate at apex (rounded and mucronate on some juveniles), 8-25 cm long, 7-25 mm wide, about equal in length on each leaf, serrate. Sporangia borne in small conelike groups exserted along leaf margins, each sporangium solitary, sessile, subtended by a cup-shaped involucre. Croat 12803. Occasional, in the forest or at the edges of clearings, climbing to a height of 20m. Panama and Colombia. In Panama, known from tropical moist forest in the Canal Zone, Bocas del Toro, Colón, San Blas, Panama, and Darien and from tropical wet forest in Panama and Colón.