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 Bulbophyllum sect. Minutissima Bulbophyllum mucronatum (Blume) Lindley (1830: 50) , Backer & Bakhuizen van den Brink (1968: 391) , Comber (1990: 267) , Vermeulen et al. (2015: 674) , Schuiteman et al. (2022: 128) . ( Fig. 7 ) ≡ Diphyes mucronata Blume (1825: 317) . Type:— INDONESIA . Java , [ West Java Province ,] Mont Pancar, Blume 1926 ( lectotype , designated here: L L 0058228 photo!, isolectotypes L L 0058226 photo!, L 0058227 photo!). = Bulbophyllum nanopetalum Seidenfaden (1979: 60) . Averyanov et al. (2018a: 28) . Type: — THAILAND . [ Kanchanaburi Province :] Kanburi, Thawng Phaphum, 300 m , February 1962 , GT 4284 , flowered under cultivation and dried in March 1983 ( holotype C C10016161 photo!). Habitat and phenology in Vietnam : —Creeping epiphyte. Submontane broad-leaved evergreen forests at elevation of 1000–1500 m a.s.l. Rare?. Flowers in December–January. Distribution: — Vietnam : Son La Province (Thuan Chau District). Bhutan ?, Thailand , Laos , Cambodia , Peninsular Malaysia , Sumatra, Java, Borneo, Sulawesi, the Philippines . Conservation status in Vietnam : —Comprehensive conservation assessment of Bulbophyllum mucronatum is complicated by the scarcity of information about its distribution and population characteristics. At the same time, the intensive deforestation in its expected distribution area in Vietnam implies that the species is to be considered as nationally Near Threatened (NT). Notes: —In the original description of Diphyes mucronata , Blume (1825) did not cite any particular collections, but indicated the place of species origin as “in montanis Pantjar”. Pantjar Mountain in West Java is alternatively spelled as Pancar. Vermeulen et al. (2015) stated the specimen Blume 1926 from Pancar housed at L to be a type of this species (which does not fulfill the conditions of lectotypification according to Arts. 7.11 and 9.23 of ICN, Turland et al. 2018 ). We found three sheets belonging to the gathering Blume 1926 , all of which closely meet the information given in the protologue. These three sheets are deposited at L. We selected the specimen L0058228 as the lectotype following Arts. 9.3 and 9.11 of ICN as it represents best the species. The specimens L0058226 and L0058227 are isolectotypes . Bulbophyllum mucronatum is reported here as a new record for the flora of Vietnam . The discovery of this species in Vietnam was rather expectable, given its general wide distribution in Indochina and Malesia , including the recent findings from Laos ( Averyanov et al. 2018a ) and Cambodia ( Schuiteman et al. 2022 ). The record of this species in Bhutan ( Gyeltshen et al. 2021 ) remains questionable, because it is not supported by voucher herbarium specimens. Bulbophyllum mucronatum is very similar morphologically to B. nematocaulon Ridley (1920: 197 ; see also Vermeulen 1991 , Averyanov 2010 , Vermeulen et al. 2015 , Ya et al. 2021 ), but differs from the latter in closely arranged (vs. rather distant) pseudobulbs, long acuminate sepals (vs. sepals narrowly triangular to shortly acuminate), lip oblong with roundish apex (vs. lip cordate with obtuse to acute apex), and very short, indistinct stelidia 0.1–0.3 mm long (vs. stelidia distinct, 0.4–0.6 mm long). Studied specimens:— VIETNAM . Son La Province : Thuan Chau District, forest around Pha Din Pass, creeping epiphyte, 12 January 2023 , Truong Ba Vuong BV 1843 (VNM 00070005, photos LE LE01123789 https://en.herbariumle. ru/?t=occ&id=160182).