昌江双盖蕨 chang jiang shuang gai jue

Replaced synonym: Allantodia hainanensis Ching, Acta Phytotax. Sin. 9: 354. 1964, not Diplazium hainanense Ching, Bull. Fan Mem. Inst. Biol. 2: 206. 1931; A. subsilvatica Ching (1964), not D. subsilvaticum Christ (1901).

Plants small to medium-sized. Rhizome robust, ascending, brown, with dense, fleshy, shortly fibrous roots, densely scaly; scales brown, lanceolate, ca. 5 mm, glandular hairy, thickly membranous; fronds caespitose. Fertile fronds 30-70 cm; stipe brown at base, upward light stramineous, 12-30 cm, 1.5-3 mm in diam., base sparsely scaly, upward glabrous, shallowly grooved adaxially; lamina nearly 1-imparipinnate, ovate-deltoid or oblong, 20-40 × ca. 20 cm; apical pinna large, deltoid-lanceolate, 10-11 × 2-2.4 cm at base, thinly dentate, downward pinnatifid to pinnatipartite into ligulate-shaped oblong lobes, apex of lobes thinly dentate and acuminate; lateral pinnae 4-8 pairs, slightly ascending, lanceolate, 10-18 × 1-2 cm, base rounded or cuneate, margin shallowly lobed, apex acuminate and dentate; lobes orbicular, each with 4 or 5 crenate teeth; basal pinnae opposite, slightly ascending, shortly stalked, upper pinnae sessile, further upper pinnae adnate to rachis; veins pinnate, ascending, sparse. Lamina papery, green or gray-green when dry, glabrous on both surfaces; rachis and costa pale stramineous, glabrous, shallowly grooved adaxially. Sori linear, ca. 5 mm, sparse, slightly curved, from base upward to 2/3-3/4 of veinlet length, 2-4 per pinna lobe, single or double on basal acroscopic veinlet; indusia brown, linear, thinly membranous, persistent.

● Under bushes. Hainan (Changjiang).