中缅蹄盖蕨 zhong mian ti gai jue

Asplenium brevisorum Wallich ex Hooker, Sp. Fil. 3: 229. 1860.

Rhizomes shortly creeping, ascending. Fronds caespitose; fertile fronds 80-90 cm; stipe brown at base, upward stramineous, 45-55 cm, 2-3 mm in diam., base with sparse brown, lanceolate or linear-lanceolate scales, upward glabrate; lamina 2-pinnate, ovate or oblong-ovate, 35-45 cm, up to 25 cm wide at middle, base not narrowed, apex abruptly narrowed; pinnae ca. 12 pairs, alternate, ascending, with stalk 4-8 mm; basal pinnae not shortened, lanceolate, ca. 19 × 3-4 cm, base rounded-truncate, acroscopic side parallel to rachis, basiscopic side narrowly cuneate, pinnate, apex long acuminate; pinnules 16-18 pairs, ascending, lanceolate, 2-3 cm × ca. 8 mm at middle, base adnate to costa, margin dentate (sometimes basal pinnules shallowly lobed, with 2 or 3 small teeth at apex of segments), apex acuminate; lamina apex abruptly narrowed like lateral pinna, pinnatipartite. Veins visible on both surfaces, pinnate in pinnules, lateral veins forked. Lamina herbaceous when dried, pale yellow-brown, rachis and costae abaxially with sparse pallid unicellular glandular hairs. Sori shortly linear or J-shaped, 8-10 pairs per pinnule (if pinnules pinnatilobate then 2 or 3 pairs per pinnule segment); indusia pale brown, large, shortly linear or J-shaped, membranous, margin slightly erose, persistent. Perispore surface with prominent folds.

Forests; 800-1500 m. W Yunnan (Yingjiang Valley) [Myanmar, Nepal, Pakistan].