龙头节肢蕨 long tou jie zhi jue

Polypodium lungtauense (Ching) Ching ex C. Christensen.

Rhizome 4-5 mm in diam., densely scaly throughout; scales dark brown at center, paler toward margin, ovate-lanceolate, margin toothed, apex acuminate. Stipe dark stramineous or light castaneous, 10-20 cm, glabrous; rachis and costae stramineous, pubescent; lamina imparipinnate, oblong or deltoid-lanceolate, 30-40 × 25-30 cm; pinnae 5-7 pairs, opposite, sessile, ascending to patent, lanceolate or ovate-lanceolate, 10-12 × 2-3 cm, base rounded or cordate, cartilaginous margin entire, very narrow, apex acuminate; lamina papery, both surfaces densely pubescent. Sori orbicular to elliptic, ca. 1 mm, mostly in 3-5 rows along costa, in 2 series between veins, pairs sometimes confluent.

Epiphytic on tree trunks or on rocks; 500-2500 m. Fujian, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Sichuan, Yunnan, Zhejiang [Laos, Nepal, Vietnam].

Material of Arthromeris lungtauensis has been incorrectly identified as Polypodium himalayense Hooker (e.g., Christ, Bull. Acad. Géogr. Bot. 1902: 218. 1902; Y. C. Wu et al., Bull. Dept. Biol. Sun Yatsen Univ. 3: 306, t. 144. 1932).