毛叶轴脉蕨 mao ye zhou mai jue

Aspidium devexum Kunze, Bot. Zeitung (Berlin) 6: 259. 1848; A. intermedium J. Smith (1857), not Willdenow (1810), nor Link (1822), nor Blume (1828); A. membranaceum Hooker; Ctenitopsis devexa (Kunze) Ching & Chu H. Wang; Pleocnemia devexa (Kunze) Alderwerelt; P. membranacea (Hooker) Beddome; Sagenia gigantea (Blume) T. Moore var. minor Beddome.

Plants terrestrial, 50-70 cm tall. Rhizome erect, short, ca. 6 mm in diam., densely scaly at apex and stipe bases; scales deep brown, light glossy, lanceolate, 4-5 mm, membranous, entire, fibriform and curly at apices. Fronds clustered; stipe stramineous or brown to castaneous, 25-30 cm, 2-3 mm in diam. at base, grooved above, with sparse brown articulate hairs above, glabrous below. Lamina tripinnate-pinnatifid, bipinnatifid toward apex, green when dried, triangular, 25-40 × 20-25 cm, thinly papery, both surfaces with sparse brown articulate hairs, base subcordate, apex acuminate; rachises and main veins stramineous to brown-stramineous, densely clothed with brown articulate hairs; pinnae 3-5 pairs, subopposite, interval 1-1.5 cm; basal pinnae largest, obliquely triangular, 12-14 × 7-9 cm, stalks ca. 1 cm, bases rounded-cuneate, apices long acuminate, pinnatipartite to form 2-4 pairs of separate large pinnules at base; middle pinnae lanceolate, 7-9 × 2-2.5 cm, bases cuneate and nearly symmetrical, apices long acuminate, pinnatipartite to 2/3 way toward costa, often with some subseparate basiscopic pinnules; basal basiscopic pinnules broadly lanceolate, ca. 8 × 2 cm, bases broadly cuneate, apices long acuminate, pinnatipartite to broadly winged along costa; lobes 8-15 pairs, interval 2-3 mm, upward, falcate-lanceolate, 10-15 × 4-5 mm, margin mucronate or undulate to toothed, ciliate. Anastomosing veins forming 1 row of areoles along pinna rachis and main vein, other veins free, conspicuous on both sides. Sori orbicular, terminal on veinlets, submarginal; indusia orbicular-reniform, membranous, hairy, entire, persistent.

On rocky patches in forest gaps, especially in limestone regions; 100-1000 m (in Taiwan). Chongqing, Guangdong, Guangxi, Guizhou, Hainan, Sichuan, Taiwan, Yunnan [Indonesia, Japan (Ryukyu Islands), Malaysia, Philippines, Sri Lanka, Thailand, Vietnam; Pacific islands (Polynesia)].