川东对囊蕨 chuan dong dui nang jue

Basionym: Phegopteris stenoptera Christ, Bull. Herb. Boissier 6: 963. 1898, based on Polypodium stenopterum Baker, J. Bot. 26: 229. 1888, not Polypodium stenopteron Baker, J. Bot. 24: 183. 1886; Athyrium dielsii C. Christensen, nom. illeg. superfl.; Dryoathyrium dielsii Ching, nom. illeg. superfl.; D. stenopterum (Christ) Ching ex Y. T. Hsieh; Dryopteris dielsii C. Christensen, nom. illeg. superfl.; Nephrodium stenopterum (Christ) Diels (1899), not N. stenopteron Baker (1890).

Rhizomes creeping, ascending at apex. Fronds approximate; fertile fronds 55-85 cm; stipe upward stramineous, 20-40 cm, 2-2.5 cm in diam. at base, base with sparse brown narrowly lanceolate scales, upper part glabrate; lamina 2-pinnatipartite, ovate-oblong, 25-45 × 18-30 cm at middle, base narrowed and rounded-cuneate, apex acuminate; pinnae 8-12 pairs, basal pinnae subopposite, other pinnae alternate, shortly stalked or sessile, subspreading, broadly lanceolate, middle pinnae 12-18 × 2.5-4 cm, caudate, base inequilateral, acroscopic base narrowly cuneate or subtruncate, pinnatipartite; segments 15-18 pairs, basal segments subopposite, other segments alternate, falcate, oblong, basal pair shortened, second and third pairs of segments 1.2-2 cm × 4-8 mm, crenulate, obtuse-rounded or shortly acute. Veins pinnate in segment, lateral veins (2 or)3- or 4-forked. Lamina herbaceous when dried, green. Rachis, costae, and costules with sparse brown lanceolate small scales and brown, scalelike vermiculate hairs. Sori small, orbicular, abaxial, medial; indusia brown, orbicular-reniform, small, membranous, entire, persistent. Perispore with baculate and spinelike ornamentation.

● Damp areas in evergreen broad-leaved forests and shrubs; 500-2200 m. Guizhou, Hubei, Hunan, Sichuan, Yunnan.