直鳞肋毛蕨 zhi lin lei mao jue

Nephrodium eatonii Baker in Hooker & Baker, Syn. Fil. 276. 1867; Aspidium eatonii (Baker) Christ; A. leucostipes (Baker) Christ; Ctenitis changanensis Ching; C. confusa Ching; Dryopteris eatonii (Baker) Kuntze; D. leucostipes (Baker) C. Christensen; D. subtripinnata (Miquel) Kuntze var. leucostipes (Baker) H. Itô; Nephrodium leucostipes Baker.

Rhizomes erect or suberect; rhizome scales dark brown, linear-subulate, 5-12 mm. Stipe stramineous, 5-35 cm; stipe scales spreading, dark brown, subulate, 2-4 mm; scales on rachis and costae similar but smaller. Lamina 2-pinnate to 3-pinnatifid, triangular-lanceolate, 7-35 × 5-15 cm; pinnae 5-12 pairs; basal pinnae largest, triangular-lanceolate, 2.5-13 × 1.5-7 cm; pinnules 2-10 pairs; basal basiscopic pinnules or lobes of basal pinnae longest, 0.8-4.5 × 0.4-1.5 cm; bases of upper pinnae or upper lobes not obviously decurrent without veinlets arising from rachis. Lamina herbaceous; veins free, distinct, no veinlets arising from costae. Sori submedial, near costa, indusiate, indusia usually persistent. Perispore coarsely folded or tuberculate.

Wet places in forests, usually in limestone areas; sea level to 1400 m. Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Sichuan, Taiwan [S Japan].

The authors have not seen any material of Nephrodium eatonii var. formosana Harrington (J. Linn. Soc., Bot. 16: 29. 1877), described from Taiwan.