25. Diplazium virescens Kunze, Bot. Zeitung (Berlin). 6: 537. 1848.
淡绿双盖蕨 dan lü shuang gai jue
Plants evergreen, medium-sized. Rhizome creeping, black, ca. 8 mm in diam., apex densely scaly; scales black-brown, lanceolate, ca. 5 mm, thickly membranous, margin toothed; fronds approximate or distant. Fertile fronds 20-40 cm; stipe 2-4 mm in diam., base black-brown, with sparse black-brown scales remaining, upward stramineous or green-stramineous, glabrous. Lamina deltoid, 30-60 × 25-40 cm, 2-pinnate with pinnatilobate to pinnatifid pinnules, apex caudate-acuminate; free pinnae 8-10 pairs, alternate, slightly ascending, symmetrical or nearly symmetrical; lower pinnae broadly deltoid-lanceolate, prominently stalked, apex long acuminate; basal pinnae largest, up to 35 × 20 cm, with stalk ca. 4 cm; upper pinnae gradually shorter, lanceolate, pinnatilobate, sessile; pinnules ca. 10 pairs, alternate, spreading, usually lanceolate, sometimes oblong, base wide and asymmetrical (basiscopic lobes large and subcordate, acroscopic lobes small and truncate), sometimes symmetrical, truncate or broadly cuneate, apex acuminate, sometimes rounded; lower pinnules shortly stalked, ca. 10 × to 3 cm; pinnule lobes mostly less than 10 pairs, subspreading, contiguous, rectangular or oblong, margin serrate or subentire, apex subtruncate or rounded, repand; veins visible abaxially, not prominent adaxially, pinnate; veinlets up to 6 pairs per lobe, simple, forked, or pinnate, ascending. Lamina papery when dry, often green, pale abaxially, glabrous on both surfaces; rachis and costa stramineous or green-stramineous, glabrous, shallowly grooved adaxially. Sori oblong, short and straight, up to 5 pairs per lobe, mostly single or rarely double, medial or subcostular; indusia brown, membranous, opening acroscopically. Spores reniform or subreniform, perispore thin, aculeate. 2n = 123 (apomictic).
Evergreen broad-leaved forests; below 100-1500 m. Anhui, Chongqing, Fujian, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Sichuan, Taiwan, Yunnan, Zhejiang [Japan, Korea, Vietnam].
