10. Diplazium basahense Ching, Acta Phytotax. Sin. 9: 351. 1964.
白沙双盖蕨 bai sha shuang gai jue
Rhizome erect, apex with dense scales; scales brown, lanceolate, small, thinly serrate at margin; fronds caespitose. Fertile frond ca. 60 cm; stipe pale brown, stramineous, shiny, ca. 30 cm, ca. 3 mm in diam.; rachis pale brown-stramineous, shallowly broadly grooved adaxially; lamina 1-imparipinnate, elliptic, ca. 30 × 18 cm; pinnae often 4 pairs, subequal in size, alternate, 4-5 cm apart, oblique, stalked (stalk ca. 3 mm), narrowly lanceolate, 11-13 × 2-2.4 cm, base broadly cuneate, margin entire or weakly densely serrate above middle, apex acuminate to caudate, incurved when dry; costae raised, rounded abaxially, shallowly grooved adaxially; veinlets prominent on adaxial side, inconspicuous on abaxial side, oblique, 3 or 4 per veinlet group, thin, spreading, parallel, reaching pinna margin. Lamina thick, papery, green when dry. Sori and indusia long linear, oblique, 1 or 2 in each veinlet group, sori on acroscopic veinlet usually longer, double, other sori single.
● Dense forests; ca. 900 m. Hainan (Qiongzhong, Wuzhi Shan).