楔羽双盖蕨 xie yu shuang gai jue

Basionym: Allantodia subdilatata Ching, Acta Phytotax. Sin. 9: 355. 1964.

Plants evergreen, medium-sized. Rhizome erect, black-brown, apex with sparse scales and verrucose protuberances; scales dark brown, broadly lanceolate, ca. 6 mm, entire; fronds caespitose. Fertile frond up to 1 m or longer; stipe gray-stramineous, up to 60 cm, ca. 5 mm in diam., glabrous, grooved adaxially, base with sparse scales and verrucose processes; lamina 2-pinnate with pinnules pinnatifid, ovate-oblong, up to 80 × 60 cm, apex acuminate; pinnae up to 10 pairs, alternate, ascending, with stalk up to 3 cm, broadly oblong-lanceolate, up to 30 × 18 cm, base truncate, apex long acuminate; pinnules ca. 10 pairs, ascending, alternate, lower pinnules subsessile, upper pinnules ± adnate, deltoid-lanceolate, up to 10 × 2 cm, base wider on both sides, broadly cuneate, pinnatilobate 1/4-1/3 from margin, apex long acuminate; pinnule lobes ascending, oblong, up to 6 mm wide, entire or shallowly crenate; veins prominent, pinnate, veinlets simple, up to 5 pairs per lobe, oblique. Lamina papery, light brown when dry, glabrous on both surfaces; rachis and costae glabrous, shallowly grooved adaxially. Sori shortly linear, slightly curved, usually single per lobe (1 or 2 pairs per basal lobe), 3-5 mm, costular from costa to usually 2/3 of veinlet length, opening acroscopically; indusia light brown, linear, membranous, entire, ± persistent when mature.

● Forests. Hainan (Jianshan, Lingshui).