FLORA OF VIETNAM

Orchidaceae

Cleisostoma apertum Aver., & Vuong sp. nov.

Ha Giang prov., Quan Ba distr., Tung Vai commune, Thung Pang village, around point 23º04ʹ38.6ʺN 104º56ʹ06.8ʺE, steep rocky slopes near hill top composed with stratified highly eroded limestone at elevation 1000–1100 m a.s.l. Remnants of primary evergreen broad-leaved mossy very humid forest. Epiphyte. 17 October 2018, L. Averyanov, Nguyen Sinh Khang, T. Maisak, Truong Duc Thieu, VR 900.8. Herbarium specimen prepared in 20.06.2022, flowers pale yellowish, sepals outside with dull purple- brownish vein, lip white, backwall callus pale yellow, column white, anther cap white with longitudinal purple stripe.

All drawings © - L. Averyanov