FLORA OF VIETNAM. Fam. Urticaceae. Pellaea sp. N. Vietnam, prov. Ha Giang, distr. Yen Minh, municipality Du Gia, E. slopes of Phu Tha Ca mountain system at 1600-1700 m elev. (N 23°56' E. 105°13'). Primary evergreen broadleaved very wet mountain forest on. shale very steep slopes. Lithophyte herb on wet vertical shady. shale-quartzite cliffs along waterfall. Very common. Codominanthe of. herb forest stratum at 1600-1700 m elev. especially in wet places. No CBL 2063   03 May 1999. International Botanical Expedition of the U.S.A. National Geographic. Society (grant No 6300-98). . Collectors: P.K.Loc, P.H.Hoang, Averyanov L.