Linnaea 13: 141. 1839.
Stems ascending to erect; scales dark brown, ovate to lanceolate, margins dentate. Petiole 15–45 cm. Blade deltate-lanceolate, pinnate-pinnatifid, 20–36 × 8–22 cm, broadest at or just above base, acuminate at apex. Pinnae lanceolate-oblong, inequilateral, base cuneate basiscopically, truncate acroscopically, apex acuminate, lobed halfway or more toward costa; basal acroscopic segments of basal pinnae free, margins serrate. Veins pinnate, lateral veins simple or sometimes forked. Sori elongate, straight, single or double, indusiate; indusia vaulted, thin, erose.
Habitat: Moist wooded slopes
Elevation: lowland; very rare; 0–100 m
La., Mexico, Central America, n South America.
Central and South American species closely related to Diplazium lonchophyllum, including D. cristatum (Desrousseaux) Alston, D. drepanolobium A. R. Smith, and D. werckleanum H. Christ, are in need of monographic work (R. G. Stolze 1981; A. R. Smith 1981; J. T. Mickel and J. M. Beitel 1988).