鳞轴小膜盖蕨 lin zhou xiao mo gai jue

Davallia perdurans Christ, Bull. Herb. Boissier 6: 970. 1898; Araiostegia parvipinnula (Hayata) Copeland; Araiostegiella perdurans (Christ) M. Kato & Tsutsumi; Davallia parvipinnula Hayata; Humata perdurans (Christ) Hieronymus; Leucostegia parvipinnula (Hayata) Hayata; L. perdurans (Christ) C. Christensen.

Rhizome long creeping, robust, 6-8 mm in diam., densely covered with scales. Scales brown, broadly lanceolate, 6-7 mm, membranous, basifixed with cordate base, margin with irregular teeth, apex acuminate. Fronds remote, 3-5 cm apart; stipe brownish stramineous, adaxially thickly grooved, 25-35 cm, 3-4 mm in diam., base covered with scales, sparse upward; lamina yellowish green or brownish green when dry, 4-pinnatifid, ovate or triangular-ovate, 30-40 × 20-35 cm, base broadly rounded, apex acuminate. Pinnae 10-15 pairs, alternate or basal ones opposite, sessile, basal pair similar to upper one, elliptic or elliptic-lanceolate, 10-21 × 3.5-8 cm; pinnules 12-16 pairs, sessile, basal pair elliptic, 1.5-4.5 × 1-1.5 cm, base nearly symmetrical, apex obtuse; ultimate lobes shortly lanceolate, 1.5-3 mm, apex 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, dark brown at base, semicircular, entire, attached at base.

● Dense mixed forests, epiphytic on tree trunks; 1900-3400 m. Fujian, Guangxi, Guizhou, Jiangxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang.