New orchids in the flora of Vietnam (Orchidaceae, Aeridinae) Author Averyanov, Leonid V. 0000-0001-8031-2925 Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov Str., 197376 St. Petersburg, Russia. & av _ leonid @ mail. ru; https: // orcid. org / 0000 - 0001 - 8031 - 2925 av_leonid@mail.ru Author Thai, Tran Huy 0000-0003-1636-9729 Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Road, Cau Giay, 100000 Hanoi, Vietnam. & thaiiebr @ yahoo. com. vn; https: // orcid. org / 0000 - 0003 - 1636 - 9729 thaiiebr@yahoo.com.vn Author Truong, Ba Vuong 0000-0003-3452-8455 Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay District, Hanoi, Vietnam. & Institute of Tropical Biology Vietnam Academy of Science and Technology, 85 Tran Quoc Toan, District 3, Ho Chi Minh City, Vietnam. Institute of Applied Technology, Thu Dau Mot University, No. 6, Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam. & bavuong 2019 @ yahoo. com; https: // orcid. org / 0000 - 0003 - 3452 - 8455 bavuong2019@yahoo.com Author Nguyen, Van Canh 0000-0001-9578-0342 nguyenvancanh @ tdmu. edu. vn; https: // orcid. org / 0000 - 0001 - 9578 - 0342 nguyenvancanh@tdmu.edu.vn Author Nguyen, Tuan Hoang 0000-0002-9474-6342 University of Pharmacy, 15 Le Thanh Tong, Hoan Kiem, Hanoi, Vietnam. & tuandl 50 @ yahoo. com; https: // orcid. org / 0000 - 0002 - 9474 - 6342 tuandl50@yahoo.com Author Maisak, Tatiana V. 0000-0001-5919-6755 Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov Str., 197376 St. Petersburg, Russia. & tmaisak @ mail. ru; https: // orcid. org / 0000 - 0001 - 5919 - 6755 tmaisak@mail.ru Author Nguyen, Khang Sinh 0000-0001-5171-4140 Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Road, Cau Giay, 100000 Hanoi, Vietnam. & Institute of Tropical Biology Vietnam Academy of Science and Technology, 85 Tran Quoc Toan, District 3, Ho Chi Minh City, Vietnam. Institute of Applied Technology, Thu Dau Mot University, No. 6, Tran Van On Street, Phu Hoa Ward, Thu Dau Mot City, Binh Duong Province, Vietnam. & nskhang @ gmail. com; https: // orcid. org / 0000 - 0001 - 5171 - 4140 nskhang@gmail.com Author Nguyen, Van Khuong 0000-0002-1264-5178 Institute of Applied Technology, Thu Dau Mot University No. 06, Tran Van On Street, Phu Hoa Ward, The Dau Mot City, Binh Duong Province, Vietnam. & nguyenkhuongbanme @ gmail. com; https: // orcid. org / 0000 - 0002 - 1264 - 5178 nguyenkhuongbanme@gmail.com text Phytotaxa 2022 2022-07-21 555 2 113 135 journal article 105102 10.11646/phytotaxa.555.2.1 0da94742-bcc3-40fb-93a6-3e78ba907240 1179-3163 6875853 Ascocentropsis malipoensis (Liu Z.-J. & Chen L.-J.) Averyanov in Averyanov et al. (2018d: 123) . ≡ Singchia malipoensis Liu Z. -J. & Chen L.-J. (2009: 602); Cleisocentron malipoense (Z.J.Liu & L.J.Chen) R.Rice, (2018: 158) . ( Figs. 1 A, B ) Type: — CHINA . Yunnan : Malipo County , on trees in forest, alt. 1000 m , 27 Aug. 2008 , Z . J . Liu 4137 ( holotype – NOCC ) . Habitat, phenology and conservation status: —Epiphyte. Broad-leaved evergreen submontane forests on karstic limestone at elevation about 1000 m a.s.l. Fl. October–November. Very rare. Suggested IUCN Red List status – EN. Distribution: —Northern Vietnam ( Ha Giang and Lai Chau provinces), SE China (SE Yunnan ). Note: —According to available data, this very rare species has been found only in three documented locations in SE Yunnan ( China ) and in two provinces of N Vietnam ( Ha Giang and Lai Chau ) geographically forming triangle with approximate sides 200×200× 40 km and lying along the Vietnamese – Chinese border. In terms of the IUCN Red List, the species has an estimated area of occurrence (EOO) less than 4000 km 2 and area of occupancy (AOO) is 12 km 2 . There is continuing decline in the quality of habitat due to intensive deforestation and agricultural exploration throughout occurrence area. The wide loss of habitats and commercial collecting are strong factors affected the species’ population and bringing the number of mature individuals down. Hence, the species is assessed as Endangered – EN B2ab(iii, v) according to formal IUCN criteria ( IUCN 2019 ). Studied specimens: — VIETNAM , Lai Chau Province , broad-leaved limestone forest, plant collected by local collector for Mr. Loc Bao Sang, who cultivated plant in his private garden in Lam Dong , Di Linh Town, 26 October 2019 , L. Averyanov, Nguyen Van Canh , T. Maisak, AL 1187 (LE01066616 http://en.herbariumle.ru/?t=occ&id=12384, LE01088196 https://en.herbariumle.ru/?t=occ&id=43730). VIETNAM , the plant was purchased mixed with Renanthera vietnamensis , originating from Ha Giang Province , Quang Ba District and cultivated in Dalat Town, Lam Dong Province by Mr. Nguyen Phi Tam s.n. , photo of 08.11.2021 , AL 1295 (LE01123004 https://en.herbariumle. ru/?t=occ&id=110370).