1. Abrodictyum cumingii C. Presl, Hymenophyllaceae. 20-21, 63. 1843.
长片蕨 chang pian jue
Cephalomanes cumingii (C. Presl) K. Iwatsuki; Haplodictyum cumingii (C. Presl) Bosch; Trichomanes cumingii (C. Presl) C. Christensen; T. smithii Hooker.
Plants 8-12 cm tall. Rhizome ca. 0.5 mm in diam., hairs on rhizome reddish brown, lustrous, with fibrous rootlets. Stipe 2-4 cm, slender, ca. 0.3 mm in diam. Rachis brown, zigzag, glabrous, winged in upper part. Lamina bipinnate, hazel-colored when dry, elliptic, 5-10 × ca. 2 cm, glabrous, base and apex acuminate; pinnae 8-12 pairs, sessile, alternate, ovate, 5-20 × 3-6 mm, base decurrent, upper pinnae adjacent, lower ones 3-6 mm apart, several basal ones reduced to simple or furcate segments; ultimate segments narrowly linear, 5-15 × ca. 0.7 mm, with a single veinlet, entire at margin, apex acuminate. Veins dichotomous, obviously raised on each surface, brown, glabrous. Sori on upper 2/3 part of frond, apical on short acroscopic segments; involucres tubular, ca. 1 mm, winged, with dilated mouth, entire and slightly crisped at margin, lobes not constricted below base of involucre; receptacles brown, 4-5 mm.
Mountain forests, growing on Cyathea; 300-1100 m. E and SE Taiwan [Indonesia (Moluccas, Sulawesi), New Guinea, Philippines].
Elongate hemitropous internal cells are distinct in Abrodictyum cumingii.