N. Vietnam, Prov. Thai Nguyen, distr. Dai Tu, vicinities of Tam Dao town, NE macroslope of Tam Dao ridge at 950-1000 m alt. (N 21°27′ E 105°38′). Closed wet evergreen broad-leaved primary forest on very steep mt slope. Epilitic herb up to 1 m hg on steep shadow rocky wet slope. Leaves green, often above with whitish large radiating spots. Very common. VH 5049 31.05.1997 International Botanical Expedition of the U.S.A. National Geographic Society (grant No 5803-96)