毛柄双盖蕨 mao bing shuang gai jue

Allantodia crinipes (Ching) Ching; A. dilatata (Blume) Ching; A. veitchii (Christ) Ching; A. yaoshanica (Ching) Ching & C. H. Wang; Asplenium dilatatum (Blume) Hooker; A. latifolium D. Don (1825), not Bory (1803); Athyrium dilatatum (Blume) Milde; Diplazium crinipes Ching; D. latifolium T. Moore; D. veitchii Christ; D. yaoshanicum Ching.

Plants evergreen, large. Rhizome creeping to ascending or erect, erect trunk up to 50 cm tall, up to 10 cm in diam., apex densely scaly; scales dark brown or yellow-brown, linear-lanceolate or linear, margin black and toothed, apex long curly; fronds sparse or caespitose. Fertile frond up to 3 m; stipe black-brown at base, upward green-stramineous or green-brown, robust, up to 1 m, up to 1 cm in diam., base densely scaly; scales similar to those on rhizome; hairs brown, curly, short, soft, deciduous; stipe upward gradually glabrous; lamina 2-pinnate or 2-pinnate with pinnules pinnatifid, deltoid, up to 2 × 1 m, apex acuminate; pinnae up to 14 pairs, alternate, ascending; lower pinnae ovate or broadly lanceolate, up to 70 cm, upper pinnae lanceolate, base shortly stalked or adnate; pinnules up to 15 pairs, alternate, spreading, ovate-lanceolate or lanceolate, up to 20 × 4 cm, shortly stalked or sessile, base shallowly cordate or broadly cuneate, pinnatilobate to pinnatifid or incised, apex long acuminate or caudate; pinnule lobes up to 15 pairs, slightly ascending, margin shallowly serrate or subentire, apex rounded or truncate; basal basiscopic lobes often prominently large; veins pinnate, veinlets up to 8 pairs per pinnule lobe, simple, ascending, reaching pinnule margin (basal acroscopic veinlets sometimes ending apart from margin). Lamina papery when dry, usually green or dark green on adaxial surface, costae, costules, and midribs with ± white or light brown, subspherical glands, gray-brown abaxially, with brown, linear scales and uniseriate short soft hairs; rachis and costae green-stramineous, glabrous. Sori linear, up to 7 pairs per pinnule lobe, most single, few double, inframedial from costa to 1/2 length of veinlet; indusia brown, membranous, margin ciliate, opening acroscopically, persistent. Spores subreniform, perispore prominent, few rugate. 2n = 82.

Wet broad-leaved forests in tropical mountains; 100-1900 m. Chongqing, S Fujian, Guangdong, Guangxi, E and S Guizhou, Hainan, Sichuan, Taiwan, Yunnan, S Zhejiang [India, Indonesia, S Japan, Laos, Malaysia, Myanmar, Nepal, Philippines, Thailand, Vietnam; tropical Australia, Pacific islands (Polynesia)].

Diplazium dilatatum is remarkably polymorphic in the genus: rhizome slender and creeping, ascending to robust and erect; lamina less than 1 m, fertile fronds 1-pinnate to 2-pinnate. Plants with 1-pinnate fronds have been separated as D. veitchii and D. yaoshanicum.