友水龙骨(原变种) you shui long gu (yuan bian zhong)

Polypodium amoenum Wallich ex Mettenius, Abh. Senckenberg. Naturf. Ges. 2: 131. 1856; Goniophlebium amoenum (Wallich ex Mettenius) Beddome; G. amoenum var. arisanense (Hayata) Rödl-Linder; G. amoenum var. latedeltoideum (Christ) Rödl-Linder; G. yunnanense (Franchet) Beddome; Marginaria arisanensis (Hayata) Nakai ex H. Itô; Polypodiodes yunnanensis (Franchet) Fraser-Jenkins; Polypodium amoenum var. latedeltoideum Christ; P. arisanense Hayata; P. bonatianum Brause; P. valdealatum Christ; P. yunnanense Franchet; Schellolepis amoena (Wallich ex Mettenius) J. Smith.

Stipe and rachis straw-colored. Lamina ovate-lanceolate in outline, basal 1 or 2 pairs of segments often deflexed, both surfaces glabrous.

Epiphytic on tree trunks or on rocks; 1000-2500 m. Anhui, Guangdong, Guangxi, Guizhou, Hubei, Hunan, Jiangxi, Shanxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [Bhutan, India, Laos, Myanmar, Nepal, Thailand, Vietnam].

The binomial was first used by Wallich (Numer. List, no. 290. 1829). "Marginaria amoena" (C. Presl, Tent. Pterid. 188. 1836) also belongs here. Both names are nomina nuda and were not therefore validly published (Melbourne Code, Art. 38.1(a)).