陕西对囊蕨 shan xi dui nang jue

Athyrium giraldii Christ, Nuovo Giorn. Bot. Ital., n.s., 4: 91. 1897; A. sargentii C. Christensen; A. subsimile Christ; Deparia subsimilis (Christ) Fraser-Jenkins; Lunathyrium giraldii (Christ) Ching.

Rhizomes erect or ascending, clothed with brown, membranous, ovate-lanceolate scales at apices and stipe bases. Fronds caespitose; fertile fronds (30-)50-70(-90) cm; stipe stramineous, occasionally brownish chestnut abaxially, (6-)10-15(-28) cm, 1.5-4 mm in diam., base with rather dense scales, upward scales sparse or nearly absent, with sparse, thin, short multicellular hairs; lamina pinnate, oblong-lanceolate or ovate-lanceolate, (25-)35-60(-75) × 10-15(-28) cm, base slightly narrowed, apex acuminate; pinnae pinnatipartite, (15-)20-25 pairs, middle pinnae linear-lanceolate, 5-8(-14) × 1-2 cm, base broader, truncate, apex acuminate, pinnae alternate, ascending, 2-2.5 cm apart, only few pairs of lower pinnae slightly shortened, subopposite; basal pinnae 2-4.5 cm, not auriculate; pinna segments 15-22 pairs, oblong, (4-)6(-10) × 3-4 mm, adnate to narrow wing, subspreading, 1-2 mm apart, crenulate or subentire at margin, apex obtuse-rounded or obtuse; segments of basal pinnae longer. Veins visible abaxially, pinnate in segments, 4-6(or 7) pairs, simple. Lamina herbaceous or subpapery when dried, green or greenish brown, rachis and costae abaxially with sparse hyaline multicellular short hairs, with multicellular hairs at sinus between segments. Sori oblong to narrowly lunate, 1-1.5 mm, 2-6 pairs per segment; indusia similar to sori, pale brown, erose or somewhat ciliate at margin, usually with short glandular hairs on lower part of back, persistent. Spores bilateral, perispore surface rugate-saccate, papillate or verrucose processes. 2n = 80*.

● Valley forests; 900-2900 m. S Gansu, Henan, Hubei, Ningxia, Shaanxi, Shanxi, Sichuan.