Terrestrial, small to medium-sized; rhizomes climbing, 1.5-2 mm diameter.
Leaves
Fronds 13-37 X 8-12 cm; stipe long, usually 1/3-1/2 frond length, fine dark hairs at base; blade 2- to 3-pinnate, triangular, widest at base, dark green, stiff-membranous, glabrous, in living plants blades often incline at 45° angle to stipe; pinnae lanceolate, tips acuminate; ultimate segments deeply lobed lobe tips dentate; veins free, forked, prominent.
Sori
Sori marginal, arising in sinuses, usually on short, bent stalks, commonly oriented at right angle to blade, often absent; indusia, narrowly cone-shaped, tips slightly flared.
Notes
Greek kyrtos, curved, + theke, case, sheath, supposedly in reference to the indusium being bent out of the plane of the blade.
