Descripcion

Epiphytic or lithophytic ferns. Rhizomes longcreeping, filiform, branched, c. 0.3 mm in diameter, densely covered with long, slender, simple, dull brown hairs, rootless or with root-like shoots covered by the same hairs as on rhizomes. Fronds up to 2–4 cm apart. Stipes 0.5–3.0 cm long, fully winged or winged at the upper part, with base thickened, blackish, bearing hairs similar to those on the rhizomes, other parts flattened or shallowly grooved ventrally, with short, pale brown clavate hairs on entire surface. Laminae 3.0–10.0(–15.0) × 1.0–4.0 cm, green or olive-green, diaphanous, glabrous, narrowly oblong-elliptic to narrowly ovate-elliptic, or ovate, or slightly lanceolate with well attenuated to sharp apex, bipinnatifid to tripinnatifid, and with anadromous venation. Rachis widely winged with mostly significantly undulate margins. Pinnae alternate, pinnatifid to bipinnatifid, ovate or lanceolate to oblong, with margin base mostly undulate. Segments entire, linear, apically emarginate, often with undulating margins, and sometimes but not always with longitudinal folds parallel to true veins (especially when dry), false veins absent. Costae and veins prominent on both sides, with clavate hairs similar to those on the stipe. Lamina cells thin-walled, slightly elongate, mostly hexagonal. Sori paratactic, adaxially borne on the proximal pinnae and/ or pinnules, (4–)6 to more than 15 (in largest specimens) per fertile frond; indusia obconical to campanulate, 1.0– 1.5 × 0.8–1.2 mm, slightly bordered on both sides by laminar cells, forming a wing, and with few clavate hairs; mouth of indusia slightly dilated; receptacles cylindrical and filiform, short to long-exerted up to twice or more the sorus length (Ponce et al. 2017: 13)