大叶叉蕨 da ye cha jue

Nephrodium cicutarium (Linnaeus) Baker var. dubia C. B. Clarke & Baker, J. Linn. Soc., Bot. 24: 417. 1888; Aspidium dubium (C. B. Clarke & Baker) Beddome; Tectaria jinpingensis Ching & Chu H. Wang.

Plants terrestrial, 1.5-2 m tall. Rhizome erect, short, stout, ca. 3 cm in diam., densely scaly at apex and stipe bases; scales stiff, dark brown, linear-lanceolate, 8-10 mm, thickly membranous, entire, apices long acuminate. Stipes clustered, dark brown to castaneous, ca. 1 m, 1-1.5 cm in diam., sparsely covered with light brown articulate hairs. Lamina tripinnatifid, dark green when dried, deltoid, ca. 1 × 1 m, papery, base slightly cordate, apex acuminate; rachises and costae dark brown, densely covered with articulate hairs; pinnae 6 pairs, oblique, opposite at base and alternate upward, interval ca. 10 cm; basal pinnae 40-50 cm, rather large, ovate-deltoid, stalks 5-6 cm, pinnules 8-10 pairs, broadly falcate-lanceolate, 20-25 cm, alternate, upward, interval 1.5-2 cm, pinnate with 1-3 separate pinnules, pinnatifid to broad wings of costae upward, segments 10-12 pairs, falcate-lanceolate, 3-5 × 0.8-1.5 cm, undulate or entire; lateral pinnae broadly lanceolate, subsessile, ca. 30 cm, bases cuneate, apices long acuminate, pinnate-lacerate to lanceolate acute lobes. Veinlets forming copious subhexagonal areoles, main veins and veinlets clothed with brown articulate hairs, included veinlets forked. Sori orbicular, on anastomosing veins, irregularly arranged beside main veins; indusia brown, reniform, membranous, entire, persistent.

Near streams in dense forests; 600-1000 m. Yunnan [Bhutan, NE India, Nepal, Vietnam].