格林双盖蕨 ge lin shuang gai jue

Basionym: Allantodia glingensis Ching & Y. X. Lin, Acta Phytotax. Sin. 22: 199. 1984.

Plants evergreen, medium-sized to large. Rhizome erect, apex densely scaly; scales dark brown, membranous, margin black, narrow and toothed; fronds caespitose. Fertile frond up to 1 m or longer; stipe black-brown at base, ca. 50 cm, ca. 5 mm in diam., with sparse scales similar to those on rhizome; lamina 2-pinnate, ovate-deltoid, ca. 65 × 45 cm, apex acuminate; pinnae ca. 10 pairs, alternate, slightly ascending, oblong, up to 25 × 12 cm, with stalk up to 2.5 cm, apex long acuminate; lower pinnae pinnatilobate, upper pinnae shallowly incised or subentire; fifth or upper pairs of pinnae shallowly lobed into orbicular lobes or entire, lanceolate, gradually shortened to 5 cm, ca. 1.5 cm wide, base broader, asymmetrical, rounded-cuneate; pinnules up to 6 pairs, sessile, shortly lanceolate, up to 7 × 1.5 cm, base slightly asymmetrical, rounded-truncate or subtruncate, entire, apex acuminate; basal 1 or 2 pairs of pinnules slightly shortened; veins pinnate, slightly visible. Lamina brown-green when dry, thickly papery, glabrous adaxially, costules and midribs abaxially with brown, lanceolate scales. Sori and indusia brown, linear, mostly single, few double, inframedial, from midrib to nearly 1/2 of veinlet length, easily deciduous.

● Evergreen broad-leaved forests. SE Xizang (Mêdog).