New orchids in the flora of Vietnam VIII (Orchidaceae: Epidendroideae, tribes Malaxideae, Neottieae and Podochileae) Author Averyanov, Leonid V. 0000-0001-8031-2925 Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov Street, 197022, St. Petersburg, Russia av_leonid@mail.ru Author Nguyen, Van Canh 0000-0001-9578-0342 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 nguyenvancanh@tdmu.edu.vn Author Vuong, Truong Ba 0000-0003-3452-8455 Institute of Tropical Biology, Vietnam Academy of Science and Technology, 85, Tran Quoc Toan Street, District 3, Ho Chi Minh City, Vietnam bavuong2019@yahoo.com Author Nuraliev, Maxim S. 0000-0001-8291-2633 Department of Higher Plants, Biological Faculty, M. V. Lomonosov Moscow State University, 1, 12, Leninskie Gory, 119234, Moscow, Russia & Joint Russian-Vietnamese Tropical Scientific and Technological Center, 63, Nguyen Van Huyen Street, Cau Giay District, 122000, Hanoi, Vietnam max.nuraliev@gmail.com 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 District, Hanoi, Vietnam & Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18, Hoang Quoc Viet Road, Cau Giay District, Hanoi, Vietnam nskhang@gmail.com Author Maisak, Tatiana V. 0000-0001-5919-6755 Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov Street, 197022, St. Petersburg, Russia tmaisak@mail.ru Author Yudova, Daria A. 0000-0002-3214-5795 Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov Street, 197022, St. Petersburg, Russia gloomy_lars@mail.ru Author Saidov, Nikita T. 0000-0002-3940-6628 Komarov Botanical Institute of the Russian Academy of Sciences, 2, Prof. Popov Street, 197022, St. Petersburg, Russia nick-saidov@yandex.ru Author Nguyen, Cuong Huu 0000-0003-2281-741X Vietnam National University of Forestry, Xuan Mai, Chuong My, Hanoi, Vietnam nguyenhuucuong.tvr@gmail.com Author Nong, Duy Van 0000-0002-1509-4412 Tay Nguyen Institute for Scientific Research, Vietnam Academy of Science and Technology, Da Lat, Vietnam nongvanduy07@yahoo.com.vn text Phytotaxa 2024 2024-07-02 658 1 1 49 http://dx.doi.org/10.11646/phytotaxa.658.1.1 journal article 10.11646/phytotaxa.658.1.1 1179-3163 13217417 Dendrobium sect. Calcarifera Dendrobium lampongense Smith (1908: 14) , Seidenfaden & Wood (1992: 381) , Wood & Cribb (1994: 254) , Seidenfaden (1997: 36) , Comber (2001: 610) , Wood (2014: 374) , Teoh (2021: 310) . ( Fig. 10A ) Type: — INDONESIA . Sumatra : Lampung Province , D. Brautigam s.n. ( holotype BO , fide Wood & Cribb 1994 ). Habitat and phenology in Vietnam : —Clustering epiphyte. Primary and old secondary lowland broad-leaved evergreen forests. Very rare. Flowers in October–December (under cultivation). Distribution: — Vietnam : provinces Dak Lak ( sine loc .) and Lam Dong (Bao Loc District). Peninsular Thailand , Peninsular Malaysia , Sumatra, Borneo. Conservation status in Vietnam : —Two available Vietnamese records of this remarkable species are based on cultivated wild collected plants originated from Dak Lak and Lam Dong provinces ; their exact locations remain unknown, however, the area of occupancy is inferred as < 10 km 2 . The species is a typical element of lowland primary forests, which are being dramatically destroyed almost everywhere in southern Vietnam. Taking into consideration the very small area of occupation, decreasing area and quality of habitats, as well as severe plant exploitation, we estimate the national conservation status of this species as Critically Endangered ( CR ) on the basis of the following criteria: B2 ab(i,ii,iii). The conservation status of this species outside Vietnam has never been evaluated . Notes: — Dendrobium lampongense was earlier believed to have predominantly Malesian distribution. The discoveries reported here essentially expand its known distribution area, being its first known localities in Eastern Indochina.Throughout its distribution range, this nice-flowering species is very rare. It is widely collected for cultivation as an ornamental plant. As a result, it probably stands on the verge of full extinction in nature in a significant portion of its modern distribution area. Studied specimens:— VIETNAM . Dak Lak Province : wild collected plant cultivated in private garden of B.Q. Viet, photos made on 19 October 2017 , L. Averyanov, T. Maisak, AL2814 (photos LE LE01088698 https:// en.herbariumle.ru/?t=occ&id=57917). VIETNAM . Lam Dong Province : wild collected plant originated from Bao Loc District, cultivated in private garden of Hoang Thai Ha, photos made on 28 November 2015 , L. Averyanov, T. Maisak, AL2813 (photos LE LE01088699 https://en.herbariumle.ru/?t=occ&id=57918).