波密蹄盖蕨 bo mi ti gai jue

Fertile fronds 36-40 cm; stipe blackish brown at base, upward brown-stramineous, 17-20 cm, 1.5-3.5 mm in diam. at base, upward glabrate; lamina bipinnatipartite, oblong-lanceolate, up to 20 × ca. 10 cm at middle, base not narrowed and subtruncate, apex shortly acuminate; pinnae 16-18 pairs, basal pinnae opposite, upper pinnae alternate, spreading, sessile, basal pinnae slightly shortened, not narrowed, broader, subtruncate at base, subbasal pinnae linear-lanceolate, 4.3-4.8 × ca. 1.2 cm at middle, base widened, truncate, pinnatipartite, apex shortly acuminate; pinna segments ca. 14 pairs, spreading, separate from each other, rhomboid, ca. 4.5 × 2 mm, margin subentire, apex rounded-truncate, with 3-5 teeth; upper pinnae similar to second basal pinnae, gradually shortened. Veins inconspicuous adaxially, visible abaxially, pinnate in segments, lateral veins 2 or 3 pairs, oblique, simple. Lamina thickly papery when dried, greenish brown, with sparse pale short hairs on adaxial surface, subglabrate abaxially; rachis brownish stramineous, wing of costae with short hairs at margin, purplish red abaxially, rachis and costa with needlelike thick spines on adaxial side at base of costa or costule. Sori orbicular or elliptic, 1-5 per segment, often up to 6 in basal acroscopic segments; indusia brown, horseshoe-shaped or elliptic, rarely orbicular-reniform, membranous, entire, persistent. Perispore surface without folds.

● Shrub groves; ca. 4100 m. SE Xizang.