陕甘对囊蕨 shan gan dui nang jue

Basionym: Dryoathyrium confusum Ching & Y. P. Hsu, Fl. Tsinling. 2: 213. 1974.

Rhizomes creeping, ascending at apex. Fronds approximate; fertile fronds 50-65 cm; stipe upward stramineous, 20-25 cm, ca. 2 mm in diam. at base, base with sparse brown ovate-lanceolate scales, upper part glabrate; lamina 2-pinnatipartite, narrowly ovate, 30-40 × 23-28 cm at middle, base narrowed and rounded-cuneate, apex acuminate and pinnatifid; pinnae ca. 16 pairs, alternate, subsessile, subspreading, lanceolate, basal pinnae shortened, second basal pair 10-13 × 2.4-3 cm, somewhat caudate-acuminate, base subequilateral, rounded-cuneate; segments ca. 15 pairs, basal segments opposite, other segments alternate, spreading, oblong or rectangular, 1-1.5 cm × 5-7 mm, obtuse-rounded, subdentate; third basal pair of pinnae slightly larger, similar to second pair. Veins pinnate in segment, lateral veins usually forked, only basal acroscopic one often simple. Lamina herbaceous when dried, pale green, rachis, costae, and costules with sparse brown broadly lanceolate small scales and brown scalelike vermiculate hairs. Sori sparse, orbicular or elliptic, abaxial on base of acroscopic veins; indusia pale brown, lunate, occasionally horseshoe-shaped, membranous, entire, persistent. Perispore with baculate or spinelike ornamentation.

● Damp areas in broad-leaved forests; 1300-1500 m. SE Gansu, C and S Shaanxi.