大膜盖蕨 da mo gai jue

Acrophorus immersus (C. Presl) T. Moore; Davallia immersa Wallich ex Hooker; Humata dryopteridifrons Hayata; H. immersa (C. Presl) Mettenius.

Rhizome robust, long creeping, 3.5-5 mm in diam., densely covered with scales and yellowish brown hairs. Scales brown, lanceolate or ovate-lanceolate, ca. 3 mm, membranous, margin subentire, apex long acuminate. Fronds remote, 2-5 cm apart; stipe stramineous, 25-35 cm; lamina slightly green when dry, deltoid, 25-35 cm, nearly as wide, anadromous, papery, glabrous, tripinnate, apex acuminate; pinnae 10-12 pairs, basal pair subopposite, 4-6 cm apart, narrowly triangular and broadest toward base, with stalk 5-20 mm, base broadly cuneate, largest pinnae ovate-lanceolate, 12-22 × 6.5-12 cm, apex acuminate; pinnules 8-10 pairs, shortly stalked, alternate, ovate to elliptic, deflexed, basal pinnule 5-8 cm, base asymmetrical; ultimate leaflets rhombic, only shallowly lobed; ultimate segments (lobes) 3-4 mm wide, margin serrate; veins distinct, forking, in ultimate lobes simple, ending in submarginal orbicular hydathodes. Sori separate, 1 or 2 per segment, terminal on acroscopic veinlet; indusium attached by base only, oval or elliptic, 1-1.5 × 1-2 mm, thinly papery.

Epiphytic and terrestrial on shaded hillsides; 1000-2800 m. Guangxi, Taiwan, Xizang, Yunnan [Bhutan, Cambodia, India, Indonesia, Malaysia, Myanmar, New Guinea, Philippines, Thailand; Pacific islands (Polynesia)].

"Davallia dryopteridifrons" (Hayata, Icon. Pl. Formosan. 6: 159. 1916) is a nomen nudum and was not therefore validly published (Melbourne Code, Art. 38.1(a)).