细裂小膜盖蕨 xi lie xiao mo gai jue

Davallia clarkei Baker var. faberiana C. Christensen, Acta Horti Gothob. 1: 73. 1924; Araiostegiella faberiana (C. Christensen) M. Kato & Tsutsumi; Leucostegia clarkei (Baker) C. Christensen var. faberiana (C. Christensen) C. Christensen; L. faberiana (C. Christensen) Ching.

Rhizome long creeping, robust, 8-10 mm in diam., densely covered with scales. Scales rufous, ovate-lanceolate, 6-7 mm, membranous, basifixed with cordate base and overlapping lobes, margin with irregular teeth, apex acuminate. Fronds remote, 1.5-3 cm apart; stipe brownish stramineous, adaxially shallowly grooved, 12-15 cm, 2.5-3 mm in diam., base covered with scales similar to rhizome, sparse upward; lamina yellowish green or brown when dry, 5-pinnatifid, ovate, 30-35 × 16-20 cm, base broadly cuneate, apex acuminate. Pinnae 12-15 pairs, alternate or basal one opposite, sessile, basal pair similar to upper one, triangular-lanceolate or narrowly ovate, 15-25 × 4.5-9 cm; pinnules 12-16 pairs, alternate, shortly stalked or subsessile, narrowly ovate, 3-7 × 2-3 cm, base nearly symmetrical, apex obtuse, basal pair of pinnules catadromous; lobes narrowly linear, ca. 0.5 mm wide, acute. Rachis with several large, ovate scales at forking point. Veins inconspicuous, forked, with 1 veinlet in each lobe. Sori numerous, terminal on veinlet; indusium brown, semicircular, entire, attached at base.

Dense mixed forests, epiphytic on tree trunks; 1500-3100 m. Guizhou, Sichuan, Xizang, Yunnan [Myanmar, Thailand].