线羽蹄盖蕨 xian yu ti gai jue

Rhizomes short, erect, apex densely clothed with dark red-brown, linear-lanceolate, fibriform-tipped scales. Fronds caespitose; fertile fronds 60-70 cm; stipe stramineous, ca. 30 cm, ca. 3.5 mm in diam., base densely scaly, upward glabrate; lamina 2-pinnate-pinnatifid, ovate-oblong, ca. 40 × 20-25 cm at middle, base hardly narrowed, apex long acuminate; pinnae ca. 16 pairs, lower pinnae subopposite, upper pinnae alternate, basal pinnae slightly shortened, reflexed, base narrowed, subspreading-ascending, sessile, linear-lanceolate, 12-14 × 2-2.5 cm at middle, base truncate, equilateral, pinnate-pinnatifid, apex long acuminate; pinnules ca. 20 pairs, lower pinnules opposite, reflexed, upper pinnules alternate, spreading, oblong, 1-1.2 cm × 4-5 mm at base, base subequilateral, somewhat auriculate, decurrent and adnate to wing of costae, pinnatifid to 1/3-1/2, apex acute and toothed; veins visible abaxially, pinnate in pinnules, lateral veins ca. 8 pairs, oblique, forked, but pinnate in basal segments. Lamina papery when dried, greenish brown, glabrate on both surfaces; rachis and costae stramineous, with brownish short glandular hairs abaxially, narrow wings hairy at margin, with subulate spines on adaxial side at base of costa or costule. Sori oblong, ca. 6 pairs per pinnule, inframedial; indusia pale brown, oblong, sometimes lower indusia reniform or hooked, membranous, subentire or somewhat erose, persistent. Spores bilateral, perispore surface without folds.

● Forests; 2800-3700 m. NW Yunnan.