The review of Bulbophyllum section Tripudianthes (Orchidaceae) in the flora of Vietnam with the description of new species, B. viridipallidum Author Nguyen, Van Canh 0000-0001-9578-0342 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. & nguyenvancanh @ gmail. com; https: // orcid. org / 0000 - 0001 - 9578 - 0342 nguyenvancanh@gmail.com Author Averyanov, Leonid V. 0000-0001-8031-2925 Komarov Botanical Institute of the Russian Academy of Sciences, Prof. Popov Street 2, 197376, St. Petersburg, Russia. & av _ leonid @ mail. ru; https: // orcid. org / 0000 - 0001 - 8031 - 2925 av_leonid@mail.ru Author Maisak, Tatiana V. 0000-0001-5919-6755 Komarov Botanical Institute of the Russian Academy of Sciences, Prof. Popov Street 2, 197376, St. Petersburg, Russia. & tmaisak @ mail. ru; https: // orcid. org / 0000 - 0001 - 5919 - 6755 tmaisak@mail.ru Author Nguyen, Thi Lien Thuong 0000-0001-8219-0431 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. & thuongntl @ tdmu. edu. vn; https: // orcid. org / 0000 - 0001 - 8219 - 0431 thuongntl@tdmu.edu.vn 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 Author Pham, Thi Thanh Dat 0000-0003-0585-1050 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. & phamthithanhdat @ gmail. com; https: // orcid. org / 0000 - 0003 - 0585 - 1050 phamthithanhdat@gmail.com Author Nguyen, Danh Duc 0000-0002-3331-8571 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. & nguyendanhduc @ tdmu. edu. vn; https: // orcid. org / 0000 - 0002 - 3331 - 8571 nguyendanhduc@tdmu.edu.vn Author Dang, Van Son 0000-0001-8681-4141 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. Number 199 / 128 the connect 9 Kaset-Navamin rd. Klong Kum, Bueng Kum, Bangkok 10240. & dvsonitb @ gmail. com; https: // orcid. org / 0000 - 0001 - 8681 - 4141 dvsonitb@gmail.com Author Aromyen, Warapong 0009-0004-8510-8981 warapongnoom @ gmail. com; https: // orcid. org / 0009 - 0004 - 8510 - 8981 warapongnoom@gmail.com 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. Number 199 / 128 the connect 9 Kaset-Navamin rd. Klong Kum, Bueng Kum, Bangkok 10240. & bavuong 2019 @ yahoo. com; https: // orcid. org / 0000 - 0003 - 3452 - 8455 bavuong2019@yahoo.com text Phytotaxa 2023 2023-05-19 598 1 59 68 http://dx.doi.org/10.11646/phytotaxa.598.1.4 journal article 263159 10.11646/phytotaxa.598.1.4 7ebba404-44c5-4981-aa61-fb8e307b4042 1179-3163 7958804 2. B. wallichii Reichenbach (1861: 259) . ( Fig. 1 ). Type :— NEPAL . 1832, Wall. Cat. n. 1980 ( K000894326 photo!) . ≡ Cirrhopetalum wallichii Lindley (1839: 72) , non Wallich (1830: 51) . ≡ Tripudianthes wallichii (Reichenbach) Szlachetko & Kras (2007: 96) . ≡ Bulbophyllum refractoides Seidenfaden (1970: 342) , nom. superfluum. Habitat and phenology: —Epiphyte on tall trees in evergreen broad-leaved forest. Distribution: — Vietnam ( Lam Dong Province ), Nepal , NE India , Myanmar , China , Thailand , Laos . Proposed conservation status :—According to currently available data, B. wallichii is found only in one location as a clustering epiphyte on tall tree in primary broad-leaved forest in Lam Dong Province . There is no direct threat to this habitat. Hence the species can be assessed in Vietnam as Vulnerable based on small AOO, VU D2. Meanwhile, there is insufficient data for global distribution area of this specie where its conservation status should be identified as Data Deficient (DD). Note :— Seidenfaden (1970: 342) considered the collection, Tixier 15 (P00348218) as Bulbophyllum refractoides , which is currently accepted as a synonym of B. wallichii . However, the line drawing of Tixier on the herbarium sheet clearly shows the dorsal sepal with stiff hairs on inner surface and on the margin (not fimbriate as in B. wallichii ). We suspect the identification of this specimen may be incorrect. Meanwhile, additional specimens of the true B. wallichii were recently collected in Vietnam , in Lam Dong Province . These collections are presently confirmed by the voucher specimens ( BV 1483, 1484 ) stored at LE (LE01169312! & LE01169312!) and VNM (VNM00043086!) Herbaria. At the same time, the specimen from NE India collected by Hooker and Thomson ( P00362039 ) seem different from the type in a longer dorsal sepal with acuminate (not caudate) apex, and may represent separate variety or even species; which require detailed study . Studied specimens: — VIETNAM , Lam Dong Province , 14 December 2021 , Truong Ba Vuong & Nguyen Phi Tam, BV 1483 (photos LE01123508 !, LE01169312 ), BV 1484 ( VNM00043086 !) . INDIA , Sikkim , Donné par M . M . J-D. Hooker et Thomson 1859 s.n. ( P00362039 photo!) . INDIA , Sikkim Himalaya , December 1892 , Pantling 24 ( P00362038 photo!) .