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 Trichoglottis maculata (Smith) Smith (1918: 106) . ≡ T. lanceolaria Blume (1825: 360) var. maculata Smith (1905: 619) . = T. lanceolaria auct. non Blume, 1825 : Averyanov & Averyanova (2003: 59) . ( Figs. 8 E, F ) Type : — INDONESIA . Java : Bobodjong ( J . J . S . ); Goenoeng Batoe (not located) . Habitat, phenology and conservation status: —Epiphyte. Broad-leaved evergreen lowland forests at elevations 300–400 m a.s.l. Fl. April–June. Very rare. Suggested IUCN Red List status – EN. Distribution: —Southern Vietnam ( Dong Nai , Dak Lak and Lam Dong provinces), Thailand , Cambodia , Malaysia , E Indonesia . Note: —The discovery of this species in three locations in Dak Lak , one in Lam Dong , and one in Dong Nai Provinces is not much surprising. Vietnamese records naturally extend the known area of this species typical for lowland warm-loving forests of the southern part of Indochinese Peninsula to the east. Field observations in all recorded locations indicate this species in Vietnam as a very rare plant presented by very small, highly fragmented populations. According to discovered locations closely allied to each other, the area of its occurrence (EOO) in Vietnam are surely less than 10000 km 2 , and the area of the species occupancy (AOO) in all five known populations may be very small due to intensive deforestation and agricultural land exploitation in the area of the species occurrence. The wide loss of habitats identify the tentative conservation status of this species as a nationally Endangered – EN A3(c), B1ab(i, iii), B2ab(i, iii) according to formal IUCN criteria ( IUCN 2019 ). Studied specimens: — VIETNAM , Dac Lac Province , Buon Don District, Krong Na Municipality, Yok Don National Park, Yok Don Ridge around point 12º51’12”N 107º41’18”E , primary dry evergreen forest on thin gray soils derived from sandstone with quartzite dykes along ridge edge at elevation 300–350 m a.s.l., epiphyte on shady place, rare, 18 March 2008 , N.T.Hiep, Averyanov L., P.K.Loc, N.T.Vinh, N.S.Khang, T.H. Thai , N.V. Trai HLF 7183 , flowered in Hanoi in Hiep Garden at June 2009 (photos LE01122270 https://en.herbariumle.ru/?t=occ&id=82753). VIETNAM , Dak Lac Province , Krong No, Nguyen Van Canh s.n. photo 06 June 2015 (photos LE01122267 https://en.herbariumle. ru/?t=occ&id=82747). VIETNAM , Dak Lak Province , Krong Bong Commune, Pham Dinh Hiep, Nguyen Hoang Tuan s.n. 25.04.2018 (LE01076457 https://en.herbariumle.ru/?t=occ&id=57337, photos LE 01087096 https:// en.herbariumle.ru/?t=occ&id=18618). VIETNAM , Dong Nai Province , sine loc., 9 July 2020 , Truong Ba Vuong, BV 685 (VNM, photos LE01087104 https://en.herbariumle.ru/?t=occ&id=18627). VIETNAM , Lam Dong Province , Bao Loc District, 14 July2020 , Dinh Quang Diep, s.n. (photos LE01087095 https://en.herbariumle.ru/?t=occ&id=18617)