黑鳞轴脉蕨 hei lin zhou mai jue

Aspidium fuscipes Wallich ex Beddome, Suppl. Ferns S. Ind. 15. 1876; A. membranifolium (C. Presl) Kunze var. dimorphum (C. B. Clarke) Christ; Ctenitopsis fuscipes (Wallich ex Beddome) C. Christensen; C. glabra Ching & Chu H. Wang; Lastrea fuscipes (Wallich ex Beddome) T. Moore; Nephrodium fuscipes (Wallich ex Beddome) C. B. Clarke; N. membranifolium C. Presl var. dimorpha C. B. Clarke.

Plants terrestrial, 40-70 cm tall. Rhizome suberect or ascending, short, 1-1.5 cm in diam., densely scaly at apex; scales dark brown with narrow paler margins, glossy, lanceolate, 7-8 mm, membranous, entire, apices fibriform. Fronds clustered, dimorphic or subdimorphic, fertile fronds taller and narrower; stipe deep stramineous, 20-30 cm, ca. 3 mm in diam. at base, grooved above, sparsely covered with articulate light brown hairs, lower part clothed with dark brown scales similar to those of rhizome, becoming shorter and narrower upward. Lamina base tripinnatifid, bipinnatipartite upward, dark green when dried, elliptic-ovate, 25-40 × 15-20 cm, herbaceous, glabrous or pubescent, margins ciliate, apex acuminate; rachises stramineous, with sparse linear dark brown scales, rachises and costae densely clothed with articulate brown hairs or glabrescent abaxially; pinnae 3-10 pairs, subopposite toward base, apical ones alternate, oblique, interval 2-5 cm; basal pair of pinnae largest, obliquely triangular, 8-15 × 6-10 cm, acuminate, stalks ca. 1 cm, pinnatipartite to 3/4 way toward costa, bearing a pair of separate large pinnules; middle pinnae lanceolate, 6-10 × 3-4 cm, bases cuneate, apices acuminate, pinnatipartite to 3/4 way toward costa, occasionally with subseparate pinnules; basal basiscopic pinnules lanceolate, 6-8 × 1.5-2 cm, bases cuneate, apices acuminate, pinnatipartite to 1/2 to costa; lobes 8-12 pairs, interval 1-2 mm, falcate-oblong, 7-8 × 5-6 mm, mucronate. Veins pinnate, 8 or 9 pairs, forked, free or forming angular areoles, conspicuous on both sides. Sori orbicular, 5-7 pairs terminal on veinlets; indusia brown, orbicular-reniform, membranous, entire, persistent.

Forests; 100-600 m. Guangxi, Guizhou, Hainan, Taiwan, Xizang, Yunnan [N India, Indonesia, Myanmar, N Vietnam].