FLORA OF VIETNAM Polypodiaceae s.l. Drynarya bonii
N. Vietnam, prov. Cao Bang, distr. Ha Lang, municipality An Lac, vicinities of Phia Deng village (N 22°43′ E 106°36′), about 36 km to E from Cao Bang town. Primary open coniferous forest (with Keteleeria fortunei) along tops of remnant limestone ridge at 600 m alt. Epilite fern on open rocks. Not common.
CBL 784 29 Nov. 1998
International Botanical Expedition of the U.S.A. National Geographic Society (grant No 6300-98)