翅轴对囊蕨 chi zhou dui nang jue

Athyrium pterorachis Christ, Bull. Herb. Boissier 4: 668. 1896; Cornopteris pterorachis (Christ) Tardieu; Dryoathyrium pterorachis (Christ) Ching; Lunathyrium pterorachis (Christ) Kurata.

Rhizomes long creeping, ascending at apex. Fronds subcaespitose; fronds 1.2-1.5 m; stipe upward pale brown-stramineous, 30-70 cm, base 5-6 mm in diam., with sparse brownish, broadly lanceolate scales, upper part glabrate; lamina 3-pinnatifid, oblong, 50-70 cm or longer, 25-40 cm wide at middle, slightly narrowed to base, acuminate; pinnae ca. 16 pairs, alternate, subsessile, slightly ascending, basal pair shorter and narrowed toward base; second pair of pinnae linear-lanceolate, up to 20 × 3-4 cm, acuminate, base equilateral and truncate; pinnules 20-25 pairs, narrowly oblong or lanceolate, 1.5-2.5 cm × 4-6 mm, base broadened and adnate to costae, with interpinnular sinuses often V-shaped, pinnatilobate to pinnatipartite, apex obtuse-rounded; segments oblong or subtriangular, entire; third pair and upper pinnae similar to second pair but gradually shortened, with pinnules shallowly lobed or toothed. Veins pinnate in segment, lateral veins 2-4-paired, simple. Lamina herbaceous when dried, dark green; rachis, costae, and costules with sparse brown lanceolate small scales and scalelike vermiculate hairs. Sori oblong or horseshoe-shaped, 1(or 2) per segment; indusia brownish, elongated or horseshoe-shaped, thickly membranous, entire, persistent. Perispore with foldlike processes. 2n = 80.

Damp areas in coniferous forests; 800-1000 m. Heilongjiang, Jilin [Japan, Korea, E Russia].