长叶阴石蕨 chang ye yin shi jue

Acrophorus assamicus Beddome, Ferns Brit. India 1: t. 94. 1865; Davallia assamica (Beddome) Baker; D. micans Mettenius ex Baker; Humata micans (Mettenius ex Baker) Diels; Leucostegia assamica (Beddome) J. Smith.

Rhizome 3-5.3 mm in diam. (without scales), not white waxy. Scales whitish or red-brown, without pale border, narrowed evenly toward apex, not or seldom curling backward, peltate, 8-10 × 1.8-2.5 mm, without multiseptate hairs, toothed. Stipe adaxially grooved, 4-7 cm, glabrous or with few scales; lamina pinnate with pinnatilobed to pinnatifid pinnae toward base and in middle part, or sometimes bipinnate, narrowly ovate, elongate, 10-27 × 3.5-12 cm, glabrous, not or slightly dimorphic. Longest petiolules ca. 1 mm; pinnae narrowly ovate; longest pinnae 3.5-6 × 1-2 cm; pinna lobes of at least larger pinnae anadromous, linear-oblong, longest 7-15 × 3-4 mm. Rachises and costae glabrous. Margins of each pinna in fertile fronds thickened and decurrent on edge of grooved rachis. Veins in sterile ultimate lobes pinnate, not reaching margin; false veins not present. Sori separate, borne several or frequently single on a segment, at forking point of veins; indusium attached at broad base and hardly or not at sides, semicircular, wider than long or ± as wide as long, 0.7-1 × 0.8-1.2 mm, upper margin not elongated, truncate or slightly rounded, separated from or even with lamina margin; lamina generally extending into a tooth at both sides or only at outside of a sorus.

Wet forests, climbing on rocks or tree trunks; 900-2300 m. Xizang, Yunnan [Bhutan, India, Myanmar].