启无蹄盖蕨 qi wu ti gai jue

Rhizomes short, erect, apex densely clothed with dark brown, linear-lanceolate scales. Fronds caespitose; fertile fronds 30-55 cm; stipe stramineous, 15-20 cm, 2-3 mm in diam., base similarly scaly, upward glabrate; lamina oblong-lanceolate, 20-35 × 7-14 cm, pinnate or pinnate-pinnatifid, apex pinnatifid-acuminate; pinnae 8-14 pairs, alternate, shortly stalked, lanceolate, 3.5-8 × ca. 1.5 cm at middle, base rounded-truncate, slightly inequilateral, ± adnate to costa, slightly decurrent, pinnatipartite to 1/2-1/3, apex acuminate; pinna segments 10-15 pairs, densely closed, ascending, oblong, 3-4(-8) × 2.5-4 mm, margin toothed, apex obtuse; veins visible abaxially, inconspicuous adaxially, pinnate in segments, lateral veins 2 or 3 pairs, oblique, simple. Lamina papery when dried, greenish brown, glabrate; rachis and costae on abaxial side with sparse brownish glandular hairs. Sori shortly linear, sometimes J-shaped, rarely horseshoe-shaped, 2-5 pairs per segment, medial; indusia shortly linear, J-shaped, rarely horseshoe-shaped, thickly membranous, entire, persistent. Perispore surface without folds.

● Evergreen forests; 1000-1500 m. Hainan, S Yunnan.