察隅双盖蕨 cha yu shuang gai jue

Basionym: Allantodia subspectabilis Ching & W. M. Chu, Fl. Xizang. 1: 148. 1983.

Plants evergreen, medium-sized. Rhizome creeping, black, ca. 1 cm in diam., apex like lower part of stipe, scaly; scales adpressed, black-brown, ovate or ovate-lanceolate, entire, base cordate; fronds approximate. Fertile fronds: lamina 2-pinnate with pinnatilobate pinnules, up to 1 m × 45 cm, apex acuminate; pinnae up to ca. 10 pairs, lower pinnae subopposite, upper pinnae alternate, slightly ascending, broadly lanceolate, nearly symmetrical, with stalk up to 2.5 cm, pinnate, apex long acuminate; basal pinnae slightly shortened, second basal pinnae largest, up to 25 × 12 cm; pinnules up to 8 pairs, alternate, subspreading, lanceolate, up to 6 × 2 cm, base broader, symmetrical, subrounded, apex caudate and long acuminate; pinnule lobes up to 10 pairs, ascending, subfalcate, serrate, subtruncate at apex; basal basiscopic lobe larger; veins visible abaxially, not prominent adaxially, veinlets up to 5 pairs per lobe, ascending, usually forked or simple. Lamina papery when dry, dark colored adaxially, glabrous, rachis and costa abaxially with ovate, brown scales. Sori short, sausage-shaped, up to 4 pairs per lobe, costular, mostly single, often double; indusia brown, membranous, vaulted when mature, often irregularly ruptured on back. Spores reniform, perispore wide and hyaline, not rugate, glabrous.

● Hillsides; ca. 2200 m. SE Xizang (Zayü).