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 Pomatocalpa undulatum (Lindley) J.J. Smith ( 1912: 107) . ≡ Saccolabium undulatum Lindley (1833: 222) . ( Figs. 8 A, B ) FIGURE 8. Pomatocalpa undulatum . A, B. Inflorescences and flower, frontal view ( BV 517 ). Trachoma rhopalorrhachis . C, D. ( AL 335 ). Trichoglottis maculata . E. Flowering plant ( Nguyen Hoang Tuan s.n. ). F. Flower, frontal view ( BV 685 ). Photos by Truong Ba Vuong (A, B, F), L. Averyanov (C, D), Nguyen Hoang Tuan (E). Type: — BANGLADESH . Sylhet , Wallich 7301 ( syntypes K001127133 & K001127134 ) . Habitat, phenology and conservation status: —Epiphyte. Broad-leaved evergreen. Fl. February–March. Very rare. Suggested IUCN Red List status – DD. Distribution: —Northern Vietnam ( Thanh Hoa Province , Quan Son District), NE India , Bangladesh , E China . Note: —The distribution and conservation status of this species here newly recorded from Vietnam remains very unclear. Its discovery in Vietnam is not surprising as it was recorded from adjacent regions of mainland China and from Taiwan ( Zhou et al. 2016 , Lin et al. 2016 ). Meanwhile, without flowers, it may be easily confused with the widespread and common species, P. spicatum Breda ( 1827 t. 15). Hence, the distribution of this rather unattractive species in Vietnam may be much broader than it is indicated by this single record. As a result, the conservation status of this species should be assessed as the Data Deficient – DD, according to the formal IUCN criteria ( IUCN 2019 ). Studied specimens: — VIETNAM , Thanh Hoa Province , Quan Son District , Pu Man Forest , epiphyte, leaf margin undulate, apex unequally 2-lobed, flowers glabrous, slightly fragrant, tepals white, purple spotted, lip white, 26.02.2020 , Truong Ba Vuong, BV 517 ( LE01073013 https://en.herbariumle.ru/?t=occ&id=14362) .