截头对囊蕨 jie tou dui nang jue

Basionym: Lunathyrium truncatum Ching ex Z. R. Wang, Fl. Reipubl. Popularis Sin. 3(2): 510. 1999.

Rhizomes ascending, clothed with brown, membranous, broadly lanceolate scales at apex, like stipe bases. Fronds caespitose; fertile fronds 50-60 cm; stipe stramineous, ca. 10 cm, ca. 2 mm in diam., with sparse multicellular hairs and narrow scales; lamina pinnate, oblong, 40-50 × ca. 14 cm at middle, apex acuminate; pinnae pinnatipartite, ca. 20 pairs, lower 5 or 6 pairs of pinnae gradually shortened, ca. 5 mm; middle pinnae alternate, 2.5-3 cm apart, slightly ascending, linear-lanceolate, 8-9 × ca. 1.5 cm, base subtruncate, pinnatilobed to 2/3 to costa, apex long acuminate; pinna segments ca. 15 pairs, approximate, nearly as long as wide or slightly longer, oblong, ca. 4 mm, margin entire or subentire, apex truncate or retuse. Veins visible abaxially, ca. 5 pairs per segment, simple. Lamina papery when dried, greenish brown, rachis stramineous, with sparse multicellular long hairs, costae abaxially with sparse short multicellular hairs. Sori approximate, shortly linear, 1.5-2 mm, 2 or 3 pairs per segment; indusia yellow-brown, shortly linear, entire or slightly erose at margin, persistent. Spores bilateral, perispore surface with more dense papillate processes.

● About 3500 m. NW Yunnan.