Abstract
The paper presents a description of a new species, Didymoplexis gibbosa (Gastrodiinae, Gastrodieae) discovered recently in southern Vietnam. This is the fifth species of the genus reported from Vietnam. The new species is most similar to the widely distributed D. pallens. Description of the discovered species is accompanied with data on ecology, phenology and distribution, estimated IUCN Red List status, studied specimens, brief taxonomic notes and illustrations.
References
<p>Averyanov, L.V. (2011) The orchids of Vietnam. Illustrated survey. Part 3. Subfamily Epidendroideae (primitive tribes – Neottieae, Vanilleae, Gastrodieae, Nervilieae). <em>Turczaninowia</em> 14 (2): 15–100.</p>
<p>Averyanov, L.V., Nuraliev, M.S., Maisak, T.V., Kuznetsov, A.N. & Kuznetsova, S.P. (2019) <em>Didymoplexis holochelia</em> (Orchidaceae, Gastrodiinae), a new species from northern Vietnam. <em>Phytotaxa</em> 405 (1): 54–60. https://doi.org/10.11646/phytotaxa.405.1.5</p>
<p>Chen, X.Q., Liu, Z.J., Zhu, G.H., Lang, K.Y., Ji, Z.H., Luo, Y.B., Jin, X.H., Cribb, P.J., Wood, J.J., Gale, S.W., Ormerod, P., Vermeulen, J.J., Wood, H.P., Clayton, D. & Bell, A. (2009) Orchidaceae. <em>In</em>: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) <em>Flora of China</em>, vol. 25. Science Press and Missouri Botanical Garden, Beijing and St. Louis, 569 pp.</p>
<p>Cribb, P., Gautier, L., Trigui, S. & Nusbaumer, L. (2011) Two new records of Orchidaceae from Madagascar, with an updated list of species shared with continental Africa. <em>Candollea</em> 66 (2): 413–416. https://dx.doi.org/10.15553/c2011v662a22</p>
<p>Cribb, P., Gautier, L. & Nusbaumer, L. (2013) How many species are there in the holomycotrophic genus <em>Didymoplexis</em> Griff. (Orchidaceae) in Madagascar? <em>Candollea</em> 68 (1): 41–49. https://dx.doi.org/10.15553/c2013v681a3</p>
<p>Garay, L.A. (1954) Notatio Orchidologica 3. <em>Archivos do Jardim Botânico do Rio de Janeiro</em> 13: 31–54.</p>
<p>Govaerts, R., Bernet, P., Kratochvil, K., Gerlach, G., Carr, G., Alrich, P., Pridgeon, A.M., Pfahl, J., Campacci, M.A., Baptista, H.D., Tigges, H., Shaw, J., Cribb, P., George, A., Kreuz, K. & Wood, J.J. (2022) <em>World Checklist of Orchidaceae</em>. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet. Available from: http://wcsp.science.kew.org/ (accessed 12 July 2022)</p>
<p>Griffith, W. (1844) On some plants, mostly undescribed, in the H.C. Botanic Gardens, Calcutta. <em>Calcutta Journal of Natural History</em> 4: 375–390. [https://www.biodiversitylibrary.org/item/176237#page/415/mode/1up]</p>
<p>Hayata, B. (1912) <em>Icones Plantarum Formosanarum</em>. Vol. 2. Taihoku, Taipei, 156 pp. https://doi.org/10.5962/bhl.title.1316</p>
<p>Hermans, J., Rajaovelona, L. & Cribb, P. (2021) New species in Orchidaceae from Madagascar. <em>Kew Bulletin</em> 76 (1): 39–56. https://doi.org/10.1007/s12225-021-09923-w</p>
<p>Inoue, K. (2016) <em>Didymoplexis</em> Griff. <em>In</em>: Iwatsuki, K., Boufford, D.E. & Ohba, H. (Eds.) <em>Flora of Japan</em>. Vol. IVb. Kodansha LTD, Tokyo, p. 261.</p>
<p>IUCN Standards and Petitions Subcommittee (2019) <em>Guidelines for using the IUCN Red List categories and criteria</em> Ver. 14. Available from: https://cmsdocs.s3.amazonaws.com/RedListGuidelines.pdf (accessed 18 February 2022)</p>
<p>King, G. & Pantling, R. (1898) The orchids of the Sikkim-Himalaya. Part 4. <em>Annals of the Royal Botanic Garden Calcutta</em> 8: 1–342.</p>
<p>Kumar, P., Bouamanivong, S., Fischer, G.A. & Gale, S.W. (2020) <em>Didymoplexiella laosensis</em> (Orchidaceae: Epidendroideae: Gastrodieae), a new holomycotrophic orchid from Lao PDR. <em>Phytotaxa</em> 430 (1): 1–8. https://doi.org/10.11646/phytotaxa.430.1.1</p>
<p>Pedersen, H.E., Kurzweil, H., Suddee, S., de Vogel, E.F., Cribb, P., Chantanaorrapint, S., Watthana, S., Gale, S.W., Seelanan, T. & Suwanphakdee, C. (2014) Orchidaceae 2 (Epidendroideae p.p.: Neottieae, Tropidieae, Nervilieae, Gastrodieae, Thaieae, Calypsoeae, Arethuseae, Collabieae, Cymbidieae). <em>In</em>: Santisuk, T. & Balslev, H. (Eds.) <em>Flora of Thailand</em>, vol. 12, pt. 2. Prachachon Co. Ltd., Bangkok, pp. 303–670.</p>
<p>Seidenfaden, G. (1997) <em>Contributions to the orchid flora of Thailand XIII</em>. Olsen & Olsen, Fredenborg, 65 pp.</p>
<p>Seidenfaden, G. & Wood, J.J. (1992) <em>The orchids of Peninsular Malaysia and Singapore</em>. Olsen & Olsen, Fredensborg, 779 pp.</p>
<p>Smith, J.J. (1914) Die Orchideen von Java, Vierter Nachtrag. <em>Bulletin du Jardin Botanique de Buitenzorg</em>, sér. 2, 14: 1–56. [https://www.biodiversitylibrary.org/item/27224#page/97/mode/1up]</p>
<p>Suetsugu, K. & Hsu, T.C. (2019) New combinations in the genus <em>Didymoplexis</em> (Orchidaceae; Epidendroideae; Gastrodieae), with a new variety of <em>D. siamensis</em> from Amami-Oshima Island, Japan. <em>Phytotaxa</em> 388 (2): 174–178. https://doi.org/10.11646/phytotaxa.388.2.4</p>
<p>Summerhayes, V.S. (1951) African Orchids XX. <em>Kew Bulletin</em> 6 (3): 461–475. https://doi.org/10.2307/4118030</p>
<p>Tuyama, T. (1941) Orchidaceae Novae Micronesiacae (V). <em>Journal of Japanese Botany</em> 17 (9): 505–523. https://www.jjbotany.com/pdf/JJB_017_505_523.pdf</p>
<p>WCVP (2022) <em>World Checklist of Vascular Plants</em>, version 2.0. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet. Available from: http://wcvp.science.kew.org/ (accessed 12 July 2022)</p>
<p>Zhou, X., Cheng, Z., Liu, Q., Zhang, J., Hu, A., Huang, M., Hu, C. & Tian, H. (2016) An updated checklist of Orchidaceae for China, with two new national records. <em>Phytotaxa </em>276 (1): 1–148. https://doi.org/10.11646/phytotaxa.276.1.1</p>
<p>Averyanov, L.V., Nuraliev, M.S., Maisak, T.V., Kuznetsov, A.N. & Kuznetsova, S.P. (2019) <em>Didymoplexis holochelia</em> (Orchidaceae, Gastrodiinae), a new species from northern Vietnam. <em>Phytotaxa</em> 405 (1): 54–60. https://doi.org/10.11646/phytotaxa.405.1.5</p>
<p>Chen, X.Q., Liu, Z.J., Zhu, G.H., Lang, K.Y., Ji, Z.H., Luo, Y.B., Jin, X.H., Cribb, P.J., Wood, J.J., Gale, S.W., Ormerod, P., Vermeulen, J.J., Wood, H.P., Clayton, D. & Bell, A. (2009) Orchidaceae. <em>In</em>: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) <em>Flora of China</em>, vol. 25. Science Press and Missouri Botanical Garden, Beijing and St. Louis, 569 pp.</p>
<p>Cribb, P., Gautier, L., Trigui, S. & Nusbaumer, L. (2011) Two new records of Orchidaceae from Madagascar, with an updated list of species shared with continental Africa. <em>Candollea</em> 66 (2): 413–416. https://dx.doi.org/10.15553/c2011v662a22</p>
<p>Cribb, P., Gautier, L. & Nusbaumer, L. (2013) How many species are there in the holomycotrophic genus <em>Didymoplexis</em> Griff. (Orchidaceae) in Madagascar? <em>Candollea</em> 68 (1): 41–49. https://dx.doi.org/10.15553/c2013v681a3</p>
<p>Garay, L.A. (1954) Notatio Orchidologica 3. <em>Archivos do Jardim Botânico do Rio de Janeiro</em> 13: 31–54.</p>
<p>Govaerts, R., Bernet, P., Kratochvil, K., Gerlach, G., Carr, G., Alrich, P., Pridgeon, A.M., Pfahl, J., Campacci, M.A., Baptista, H.D., Tigges, H., Shaw, J., Cribb, P., George, A., Kreuz, K. & Wood, J.J. (2022) <em>World Checklist of Orchidaceae</em>. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet. Available from: http://wcsp.science.kew.org/ (accessed 12 July 2022)</p>
<p>Griffith, W. (1844) On some plants, mostly undescribed, in the H.C. Botanic Gardens, Calcutta. <em>Calcutta Journal of Natural History</em> 4: 375–390. [https://www.biodiversitylibrary.org/item/176237#page/415/mode/1up]</p>
<p>Hayata, B. (1912) <em>Icones Plantarum Formosanarum</em>. Vol. 2. Taihoku, Taipei, 156 pp. https://doi.org/10.5962/bhl.title.1316</p>
<p>Hermans, J., Rajaovelona, L. & Cribb, P. (2021) New species in Orchidaceae from Madagascar. <em>Kew Bulletin</em> 76 (1): 39–56. https://doi.org/10.1007/s12225-021-09923-w</p>
<p>Inoue, K. (2016) <em>Didymoplexis</em> Griff. <em>In</em>: Iwatsuki, K., Boufford, D.E. & Ohba, H. (Eds.) <em>Flora of Japan</em>. Vol. IVb. Kodansha LTD, Tokyo, p. 261.</p>
<p>IUCN Standards and Petitions Subcommittee (2019) <em>Guidelines for using the IUCN Red List categories and criteria</em> Ver. 14. Available from: https://cmsdocs.s3.amazonaws.com/RedListGuidelines.pdf (accessed 18 February 2022)</p>
<p>King, G. & Pantling, R. (1898) The orchids of the Sikkim-Himalaya. Part 4. <em>Annals of the Royal Botanic Garden Calcutta</em> 8: 1–342.</p>
<p>Kumar, P., Bouamanivong, S., Fischer, G.A. & Gale, S.W. (2020) <em>Didymoplexiella laosensis</em> (Orchidaceae: Epidendroideae: Gastrodieae), a new holomycotrophic orchid from Lao PDR. <em>Phytotaxa</em> 430 (1): 1–8. https://doi.org/10.11646/phytotaxa.430.1.1</p>
<p>Pedersen, H.E., Kurzweil, H., Suddee, S., de Vogel, E.F., Cribb, P., Chantanaorrapint, S., Watthana, S., Gale, S.W., Seelanan, T. & Suwanphakdee, C. (2014) Orchidaceae 2 (Epidendroideae p.p.: Neottieae, Tropidieae, Nervilieae, Gastrodieae, Thaieae, Calypsoeae, Arethuseae, Collabieae, Cymbidieae). <em>In</em>: Santisuk, T. & Balslev, H. (Eds.) <em>Flora of Thailand</em>, vol. 12, pt. 2. Prachachon Co. Ltd., Bangkok, pp. 303–670.</p>
<p>Seidenfaden, G. (1997) <em>Contributions to the orchid flora of Thailand XIII</em>. Olsen & Olsen, Fredenborg, 65 pp.</p>
<p>Seidenfaden, G. & Wood, J.J. (1992) <em>The orchids of Peninsular Malaysia and Singapore</em>. Olsen & Olsen, Fredensborg, 779 pp.</p>
<p>Smith, J.J. (1914) Die Orchideen von Java, Vierter Nachtrag. <em>Bulletin du Jardin Botanique de Buitenzorg</em>, sér. 2, 14: 1–56. [https://www.biodiversitylibrary.org/item/27224#page/97/mode/1up]</p>
<p>Suetsugu, K. & Hsu, T.C. (2019) New combinations in the genus <em>Didymoplexis</em> (Orchidaceae; Epidendroideae; Gastrodieae), with a new variety of <em>D. siamensis</em> from Amami-Oshima Island, Japan. <em>Phytotaxa</em> 388 (2): 174–178. https://doi.org/10.11646/phytotaxa.388.2.4</p>
<p>Summerhayes, V.S. (1951) African Orchids XX. <em>Kew Bulletin</em> 6 (3): 461–475. https://doi.org/10.2307/4118030</p>
<p>Tuyama, T. (1941) Orchidaceae Novae Micronesiacae (V). <em>Journal of Japanese Botany</em> 17 (9): 505–523. https://www.jjbotany.com/pdf/JJB_017_505_523.pdf</p>
<p>WCVP (2022) <em>World Checklist of Vascular Plants</em>, version 2.0. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet. Available from: http://wcvp.science.kew.org/ (accessed 12 July 2022)</p>
<p>Zhou, X., Cheng, Z., Liu, Q., Zhang, J., Hu, A., Huang, M., Hu, C. & Tian, H. (2016) An updated checklist of Orchidaceae for China, with two new national records. <em>Phytotaxa </em>276 (1): 1–148. https://doi.org/10.11646/phytotaxa.276.1.1</p>