The checklist of Raphiocarpus species (Gesneriaceae, Didymocarpinae) in the flora of Vietnam with the description of a new species, R. bicallosus Author Nguyen, Cuong Huu 0000-0003-2281-741X Vietnam National University of Forestry, Xuan Mai, Chuong My, Ha Noi, Vietnam & nguyenhuucuong. tvr @ gmail. com; https: // orcid. org / 0000 - 0003 - 2281 - 741 X nguyenhuucuong.tvr@gmail.com Author Wen, Fang 0000-0002-3889-8835 Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Gesneriad Conservation Center of China, Guangxi Institute of Botany, CN- 541006 Guilin, China & wenfang 760608 @ 139. com; https: // orcid. org / 0000 - 0002 - 3889 - 8835 Author Pham, Toai Minh 0000-0002-1033-4237 Vietnam National University of Forestry, Xuan Mai, Chuong My, Ha Noi, Vietnam & toaipm @ vnuf. edu. vn; https: // orcid. org / 0000 - 0002 - 1033 - 4237 toaipm@vnuf.edu.vn Author Nguyen, Yen Thi 0000-0001-9606-3564 Vietnam National University of Forestry, Xuan Mai, Chuong My, Ha Noi, Vietnam & yennt @ vnuf. edu. vn; https: // orcid. org / 0000 - 0001 - 9606 - 3564 yennt@vnuf.edu.vn Author Bui, Thanh Minh 0009-0006-5514-1291 Vietnam National University of Forestry, Xuan Mai, Chuong My, Ha Noi, Vietnam & minhthanh 211202 @ gmail. com; https: // orcid. org / 0009 - 0006 - 5514 - 1291 minhthanh211202@gmail.com Author Bui, Doi The 0000-0003-3689-6200 Vietnam National University of Forestry, Xuan Mai, Chuong My, Ha Noi, Vietnam & doibt @ vnuf. edu. vn; https: // orcid. org / 0000 - 0003 - 3689 - 6200 doibt@vnuf.edu.vn 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, Hanoi, 100000, Vietnam & nskhang @ iebr. vast. vn; https: // orcid. org / 0000 - 0001 - 5171 - 4140 nskhang@iebr.vast.vn Author Averyanov, Leonid V. 0000-0001-8031-2925 Komarov Botanical Institute Russian Academy of Sciences, Prof. Popov str., 2, St. Petersburg, 197376, Russia & av _ leonid @ mail. ru; https: // orcid. org / 0000 - 0001 - 8031 - 2925 av_leonid@mail.ru text Phytotaxa 2023 2023-09-28 616 3 223 234 https://phytotaxa.mapress.com/pt/article/download/phytotaxa.616.3.2/51139 journal article 276800 10.11646/phytotaxa.616.3.2 0561631c-f602-4de3-8c60-a8fe630a05dd 1179-3163 10084863 2. Raphiocarpus sinicus Chun (1946: 275) , Nguyen & Wen (2018: 1424) , Vu (2018: 45) ≡ Didissandra sinica (Chun) Wang (1975: 97) , Phuong & Xuen (2010: 60) , Wang et al. (1998: 281) . Lectotype (designated by Weber & Burtt 1998: 175 ): — CHINA . Guangxi : Shi-Wan-Ta Shan , Na-Chin-Hsu , Pa-Shi-I , 800 m , 2 August 1933 , C.L.Tso 23509 ( IBSC , isolectotype NY01287879, photo!) . Distribution :—It is found in Vietnam ( Lang Son Province ) and in SE China ( Guangxi and Guangdong provinces). Ecology and phenology :—It grows in evergreen broad-leaved lowland forests and scrub on sandstone and shale at elevations of about 1000 m a.s.l. Flowers in August–September. Conservation status :— The species is known from Guangxi and Guangdong provinces of SE China and Lang Son Province of N Vietnam , forming a narrow triangle with an approximate square of about 15000 km 2 . Since there is no current data on the size of recorded populations or conditions of their habitats, the conservation status may be estimated as Data Deficient according to IUCN criteria (2023). Additional specimens examined :— VIETNAM . Lang Son : Bac Son District , near the border with China, Le Kim Bien 8051 ( HN ) . CHINA . Guangdong : Fangchanggang , Kung P’ing, and Vicinity T’aan Faan , 25–30 August 1936 , W . T . Tsang 26725 ( P ); the same locality, 10–18 September 1936 , W . T . Tsang 26847 ( P ); Sup Man Ta Shan , 21 July 1937 , H . Y . Liang 69820 ( A ) .