羽裂叶对囊蕨 yu lie ye dui nang jue

Diplazium tomitaroanum Masamune, J. Soc. Trop. Agric. 2: 33. 1930; Athyrium dubium (D. Don) Ohwi var. crenatum (Makino) Ohwi; D. lanceum (Thunberg) C. Presl var. crenatum Makino; D. lanceum var. grandicrenatum Nakai ex H. Itô.

Rhizome slender, 2-3 mm in diam., black-brown, apex with dense scales; scales black-brown or yellow-brown, lanceolate, 2-3 × ca. 0.5 mm, thick, margin sparsely subserrate or subentire. Stipe black-brown at base, upward stramineous or gray-stramineous, 5-35 cm, 1-2 mm in diam., as scaly as rhizome; scales on upper part of stipe deciduous, sparse or glabrous, shallowly grooved on abaxial side; lamina lanceolate or narrowly linear-lanceolate, 10-15 × 1.5-5.5 cm, base up to half width of middle, truncate or cordiform, pinnatilobate to pinnatipartite, base often pinnatilobate to costa, 1-4 pairs of lobes adnate or free, apex long acuminate or acuminate; lobes up to 30 pairs, entire or slightly repand, up to 3 × 1 cm, upper and lower lobes gradually reduced, basal lobes usually larger than upper ones, oblong, symmetrical, apex rounded; veins prominent or slightly visible on both side of lamina, pinnate per lobes, veinlets simple or forked, ascending, reaching margin, 3-13 pairs per lobe. Lamina herbaceous, green when dry, dark abaxially; costa stramineous or gray-stramineous, shallowly grooved adaxially, prominent abaxially, sparsely scaly with black linear scales, with sparse gray-white unicellular thin nodose hairs, then deciduous; sori shortly linear, single or double, up to 13 pairs per lobe; indusia similar to sori, pale brown, membranous, entire. Spores reniform, lobes not prominent; perispore hyaline, with irregular aculeate and clavate processes on surface, apex of processes sparsely small aculeate.

Broad-leaved forests; 100-800 m (in Taiwan). Chongqing (Jingyun Shan), Fujian (Nanjing, Nanping), Guangdong, Hainan (Baisha), Hunan (Yizhang), Jiangxi, Sichuan (Emei Shan, Leshan), Taiwan, Yunnan (Guangnan), Zhejiang (Cangnan) [Japan].

Some specimens of Deparia tomitaroana from China are often mistakenly identified as Diplazium zeylanicum (Hooker) T. Moore (= Deparia zeylanica (Hooker) M. Kato) from Sri Lanka.