Rhizome stout, creeping, clad in ferruginous linear-subulate paleae; stipites distributed along rhizome. Stipes stout, 20-45 cm. long, clad towards base in linear paleae. Rhachis stout, grooved, nude or nearly so. Lamina deltoid to ovate-deltoid, acuminate, coriac., dark green and rather glossy above; 3-pinnate; 30-60 × 20-30 cm. Larger (lower) pinnae stalked, about lanceolate, with one elongate secondary pinna, acuminate, up to 20 cm. or more long. Secondary pinnae about ovate-lanceolate the larger again pinnate, remainder pinnatifid; segs dentate-aristate. Sori in 2 rows near midvein; indusium orbicular with minute sinus.