Trichomanes humile G.Forst.

Epiphytic ferns. Rhizomes long-creeping, 0.2–0.3 mm diameter, bearing red-brown hairs up to 0.5 mm long. Fronds 25–35 mm long. Stipes 4–10 mm long, brown proximally, green distally, narrowly winged for at least half their length, glabrous or with short scattered hairs. Laminae 1–2-pinnatifid distally to 2–3-pinnatifid proximally, ovate or elliptic or narrowly elliptic or narrowly obovate, 22–25 mm long, 4–12 mm wide, green, membranous, glabrous or with a few short scattered clavate hairs. Rachises winged throughout, green, glabrous or with a few short scattered clavate hairs. Primary pinnae in 4–6 pairs, not overlapping, narrowly ovate to broadly ovate, winged throughout; distal primary pinnae decurrent; proximal primary pinnae almost stalked; the longest primary pinnae just above or below the middle, 4–9 mm long, 2–6 mm wide. Ultimate segments linear, entire, up to 2 mm long, 0.6–1.0 mm wide, adnate, each with a single unbranched vein; apices obtuse; margins entire with a clearly defined bistratose border of elongated cells with oblique end-walls. Sori borne on short acroscopic segments near bases of primary pinnae, one on each primary pinna, immersed in lamina with a wing 1–2 cells wide at mid-length; indusia tubular, 1.5–2.5 mm long, widened at mouth; sporangia borne on a fine receptacle up to 1 mm long, projecting beyond the indusia at maturity.

Trichomanes humile is superficially similar to T. endlicherianum and T. caudatum but can be distinguished by its bistratose border of elongated cells, and sometimes by the absence of roots. Trichomanes caudatum has a border of shorter cells and T. endlicherianum a border of elongated cells, but neither are bistratose. Trichomanes humile is further distinguished by the wing of laminal cells either side of the sori which are only 1–2 cells wide at mid-length, whereas in T. endlicherianum they are 3 or more cells wide.

Occurs as an epiphyte on Cyathea milnei in dense, deeply shaded wet forest under Metrosideros kermadecensis at 450 m altitude.

In the classification of Ebihara et al. (2006), Trichomanes humile is treated as Crepdiomanes humile.