Abstract
Dendrobium fuscifaucium is described here as a new species from Laos PDR. This species was found at a local nursery and was claimed to have been collected from the limestone mountains of Kasi District (Vientiane Province). Detailed description and comparison, comparison with its allied species, D. hekouense, D. luoi and D. wangliangii is provided, along with flowering phenology and information on habitat. Multiple attempts have failed to locate this species in the wild.
References
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<p>Averyanov, L.V., Ponert, J., Nguyen, P.T., Duy, N.V., Khang, N.S. & Nguyen, V.C. (2016a) A survey of <em>Dendrobium</em> Sw. sect. <em>Formosae</em> (Benth. & Hook.f.) Hook.f. in Cambodia, Laos and Vietnam. <em>Adansonia</em> 38: 199–217. https://doi.org/10.5252/a2016n2a5</p>
<p>Averyanov, L.V., Nguyen, K.S., Maisak, T.V., Konstantinov, E.L., Nguyen, T.H. & Bounphanmy, S. (2016b) New and rare orchids (Orchidaceae) in the flora of Cambodia and Laos. <em>Turczaninowia</em> 19: 5–58. https://doi.org/10.14258/turczaninowia.19.3.1</p>
<p>Averyanov, L.V., Nguyen, K.S. & Maisak, T.V. (2018) <em>Chiloschista pulchella</em> (Orchidaceae: Aeridinae) new orchid species from Lao PDR. <em>Taiwania</em> 63: 389–392. https://doi.org/10.6165/tai.2018.63.389</p>
<p>CEPF (2022) Biodiversity Hotspot maps. Conservation International Foundation. Published on the internet: http://www.cepf.net/Pages/default.aspx (accessed 21 January 2022)</p>
<p>Cribb, P., Averyanov, L., Schuiteman, A. & Want, T. (2021) 973. <em>Dendrobium hekouense</em>. <em>Curtis’s Botanical Magazine</em> 38: 82–88. https://doi.org/10.1111/curt.12375</p>
<p>Deng, X.X., Chen, Y.K., Rao, W.H. & Chen, L.J. (2016) <em>Dendrobium luoi</em>, a new species of Orchidaceae from China. <em>Plant Science Journal</em> 34: 9–12. https://doi.org/10.11913/PSJ.2095-0837.2016.10009</p>
<p>Gale, S.W. & Phaxaysombath, T. (2017) Studies in Asian <em>Nervilia</em> (Orchidaceae) VII: <em>Nervilia</em> <em>kasiensis</em>, a new Lao endemic. <em>Blumea</em> 62 (1): 1–5. https://doi.org/10.3767/000651917X694732</p>
<p>Gale, S.W., Schuiteman, A., Watthana, S., Sando, T., Souvannakhoummane, K., Averyanov, L.V. & Suddee, S. (2016) Studies in Asian <em>Nervilia</em> (Nervilieae, Epidendroideae, Orchidaceae) VI: <em>N. mekongensis</em>, a new species from Thailand, Cambodia, Laos and Vietnam. <em>Phytotaxa</em> 247: 267–273. https://doi.org/10.11646/phytotaxa.247.4.4</p>
<p>Gale, S.W., Kumar, P. & Phaxaysombath, T. (2018) <em>A guide to orchids of Laos</em>. Natural History Publications, Borneo, 204 pp.</p>
<p>George, E., George, J.C. & Rakthai, P. (2017) <em>Coelogyne pseudoviscosa</em>, a new <em>Coelogyne</em> species from Laos. <em>Orchideen Journal</em> 24: 3–7.</p>
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<p>Hu, G.W., Long, C.L. & Jin, X.H. (2008) <em>Dendrobium wangliangii</em> (Orchidaceae), a new species belonging to section <em>Dendrobium</em> from Yunnan, China. <em>Botanical Journal of the Linnean Society</em> 157: 217–221. https://doi.org/10.1111/j.1095-8339.2008.00800.x</p>
<p>IUCN (2019) <em>Guidelines for using the IUCN Red List categories and criteria</em>, version 14. Prepared by the Standards and Petitions Committee. Available at: http://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 28 March 2022)</p>
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<p>Kumar, P., Gale, S.W., Schuiteman, A., Bouamanivong, S. & Fischer, G.A. (2016) Identifying orchid hotspots for biodiversity conservation in Laos: the limestone karst vegetation of Vang Vieng District, Vientiane Province. <em>Journal of Threatened Taxa</em> 8: 9397–9417. https://dx.doi.org/10.11609/jott.2826.8.12.9397-9417</p>
<p>Kumar, P. & Gale, S.W. (2020a) Additions to the orchid flora of Laos and taxonomic notes on orchids of the Indo-Burma region–II. <em>Taiwania</em> 65: 47‒60. https://doi.org/10.6165/tai.2020.65.47</p>
<p>Kumar, P., Bouamanivong, S., Fischer, G.A. & Gale, S.W. (2020b) <em>Didymoplexiella laosensis</em> (Orchidaceae: Epidendroideae: Gastrodieae), a new holomycotrophic orchid from Lao PDR. <em>Phytotaxa</em> 430: 1–8. https://doi.org/10.11646/phytotaxa.430.1.1</p>
<p>Liu, Z.J. & Chen, L.J. (2011) <em>Dendrobium hekouense</em> (Orchidaceae), a new species from Yunnan, China. <em>Annales Botanici Fennici</em> 48: 87–90. [https://www.jstor.org/stable/23728247]</p>
<p>Newman, M., Ketphanh, S., Svengsuksa, B., Thomas, P., Sengdala, K., Lamxay, V. & Armstrong, K. (2007) <em>A checklist of the vascular plants of Lao PDR</em>. Royal Botanic Garden, Edinburgh, 394 pp.</p>
<p>Pridgeon, A.M., Cribb, P.J., Chase, M.W. & Rasmussen, F. (2014) <em>Genera orchidacearum</em>, volume 6, Epidendroideae (part three)<em>.</em> Oxford University Press, Oxford. 544 pp.</p>
<p>Schuiteman, A. & Bonnet, P. (2009) <em>Holcoglossum calcicola</em> und <em>Paphiopedilum barbigerum</em> var. <em>sulivongii</em>: zwei attractive neue Orchideen der Kalksteinberge von Laos. <em>Orchideen</em> <em>Journal</em> 16: 1–8.</p>
<p>Schuiteman, A., Bonnet, P., Svengsuksa, B. & Barthelémy, D. (2008) An annotated checklist of the Orchidaceae of Laos. <em>Nordic Journal of Botany</em> 26: 257–316.</p>
<p>Schuiteman, A., Sulivong, L.A. & Iio, S. (2018) <em>Paphiopedilum papilio-laoticus</em> (Orchidaceae), a new species from Laos. <em>Orchideen Journal</em> 6: 3–5.</p>
<p>Souvannakhoummane, K., Kumar, P., Gale, S.W., Lanorsavanh, S. & Lamxay, V. (2018) Three new additions to the orchid flora of Lao PDR. <em>Thai Journal of Botany</em> 10: 145–151.</p>
<p>Souvannakhoummane, K., Lanorsavanh, S., Rakthai, P., Kumar, P. & Gale, S.W. (2021) <em>Cymbilabia sourioudongii</em> (Orchidaceae), a new species from Lao PDR. <em>Rheedea</em> 31: 186–190. https://dx.doi.org/10.22244/rheedea.2021.31.03.08</p>
<p>Svengsuksa, B. & Lamxay, V. (2005) <em>Field guide to the orchids of Lao PDR</em>. National University of Lao PDR,Vientiane, 185 pp.</p>
<p>Swartz, O. (1799) Dianome epidendri generis Linn. <em>In:</em> <em>Nova</em> <em>Acta Regiae Societatis Scientiarum Upsaliensis</em>, 2nd ser, part 6. Edman, Uppsala, pp. 61–88.</p>
<p>Thouars, L.M.A. (1822) <em>Histoire particulière des plantes orchidées recueillies sur les trois iles australes d’Afrique, de France, de Bourbon et de Madagascar</em>. Bertrand, Paris, tab. 93.</p>
<p>Tordoff, A.W., Bezuijen, M.R., Duckworth, J.W., Fellowes, J.R., Koenig, K., Pollard, E.H.B. & Royo, A.G. (2011) <em>Ecosystem profile: Indo-Burma biodiversity hotspot</em>. Critical Ecosystem Partnership Fund, 360 pp.</p>
<p>Averyanov, L.V., Ponert, J., Nguyen, P.T., Duy, N.V., Khang, N.S. & Nguyen, V.C. (2016a) A survey of <em>Dendrobium</em> Sw. sect. <em>Formosae</em> (Benth. & Hook.f.) Hook.f. in Cambodia, Laos and Vietnam. <em>Adansonia</em> 38: 199–217. https://doi.org/10.5252/a2016n2a5</p>
<p>Averyanov, L.V., Nguyen, K.S., Maisak, T.V., Konstantinov, E.L., Nguyen, T.H. & Bounphanmy, S. (2016b) New and rare orchids (Orchidaceae) in the flora of Cambodia and Laos. <em>Turczaninowia</em> 19: 5–58. https://doi.org/10.14258/turczaninowia.19.3.1</p>
<p>Averyanov, L.V., Nguyen, K.S. & Maisak, T.V. (2018) <em>Chiloschista pulchella</em> (Orchidaceae: Aeridinae) new orchid species from Lao PDR. <em>Taiwania</em> 63: 389–392. https://doi.org/10.6165/tai.2018.63.389</p>
<p>CEPF (2022) Biodiversity Hotspot maps. Conservation International Foundation. Published on the internet: http://www.cepf.net/Pages/default.aspx (accessed 21 January 2022)</p>
<p>Cribb, P., Averyanov, L., Schuiteman, A. & Want, T. (2021) 973. <em>Dendrobium hekouense</em>. <em>Curtis’s Botanical Magazine</em> 38: 82–88. https://doi.org/10.1111/curt.12375</p>
<p>Deng, X.X., Chen, Y.K., Rao, W.H. & Chen, L.J. (2016) <em>Dendrobium luoi</em>, a new species of Orchidaceae from China. <em>Plant Science Journal</em> 34: 9–12. https://doi.org/10.11913/PSJ.2095-0837.2016.10009</p>
<p>Gale, S.W. & Phaxaysombath, T. (2017) Studies in Asian <em>Nervilia</em> (Orchidaceae) VII: <em>Nervilia</em> <em>kasiensis</em>, a new Lao endemic. <em>Blumea</em> 62 (1): 1–5. https://doi.org/10.3767/000651917X694732</p>
<p>Gale, S.W., Schuiteman, A., Watthana, S., Sando, T., Souvannakhoummane, K., Averyanov, L.V. & Suddee, S. (2016) Studies in Asian <em>Nervilia</em> (Nervilieae, Epidendroideae, Orchidaceae) VI: <em>N. mekongensis</em>, a new species from Thailand, Cambodia, Laos and Vietnam. <em>Phytotaxa</em> 247: 267–273. https://doi.org/10.11646/phytotaxa.247.4.4</p>
<p>Gale, S.W., Kumar, P. & Phaxaysombath, T. (2018) <em>A guide to orchids of Laos</em>. Natural History Publications, Borneo, 204 pp.</p>
<p>George, E., George, J.C. & Rakthai, P. (2017) <em>Coelogyne pseudoviscosa</em>, a new <em>Coelogyne</em> species from Laos. <em>Orchideen Journal</em> 24: 3–7.</p>
<p>Govaerts, R., Bernet, P., Kratochvil, K., Gerlach, G., Carr, G., Alrich, P., Pridgeon, A.M., Pfahl, J., Campacci, M.A., Baptista, D.H., Tigges, H., Shaw, J., Cribb, P.J., George, A., Kreuz, K. & Wood, J.J. (2022) <em>World checklist of Orchidaceae</em>. Royal Botanic Gardens, Kew. Available from http://wcsp.science.kew.org/ (accessed 6 January 2022)</p>
<p>Gruß, O., Rungruang, N., Chaisuriyakul, Y. & Dionisio, I. (2014) The <em>Paphiopedilum</em> <em>rungsuriyanum</em>, eine neue Art aus Nord-Laos. <em>Orchideen Journal</em> 21: 3–11.</p>
<p>Hu, G.W., Long, C.L. & Jin, X.H. (2008) <em>Dendrobium wangliangii</em> (Orchidaceae), a new species belonging to section <em>Dendrobium</em> from Yunnan, China. <em>Botanical Journal of the Linnean Society</em> 157: 217–221. https://doi.org/10.1111/j.1095-8339.2008.00800.x</p>
<p>IUCN (2019) <em>Guidelines for using the IUCN Red List categories and criteria</em>, version 14. Prepared by the Standards and Petitions Committee. Available at: http://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 28 March 2022)</p>
<p>Kumar, P., Gale, S.W., Pedersen, H.Æ., Phaxaysombath, T., Bouamanivong, S. & Fischer, G.A. (2018) Additions to the orchid flora of Laos and taxonomic notes on orchids of the Indo-Burma region. <em>Taiwania</em> 63: 61–83. https://doi.org/10.6165/tai.2018.63.61</p>
<p>Kumar, P., Gale, S.W., Schuiteman, A., Bouamanivong, S. & Fischer, G.A. (2016) Identifying orchid hotspots for biodiversity conservation in Laos: the limestone karst vegetation of Vang Vieng District, Vientiane Province. <em>Journal of Threatened Taxa</em> 8: 9397–9417. https://dx.doi.org/10.11609/jott.2826.8.12.9397-9417</p>
<p>Kumar, P. & Gale, S.W. (2020a) Additions to the orchid flora of Laos and taxonomic notes on orchids of the Indo-Burma region–II. <em>Taiwania</em> 65: 47‒60. https://doi.org/10.6165/tai.2020.65.47</p>
<p>Kumar, P., Bouamanivong, S., Fischer, G.A. & Gale, S.W. (2020b) <em>Didymoplexiella laosensis</em> (Orchidaceae: Epidendroideae: Gastrodieae), a new holomycotrophic orchid from Lao PDR. <em>Phytotaxa</em> 430: 1–8. https://doi.org/10.11646/phytotaxa.430.1.1</p>
<p>Liu, Z.J. & Chen, L.J. (2011) <em>Dendrobium hekouense</em> (Orchidaceae), a new species from Yunnan, China. <em>Annales Botanici Fennici</em> 48: 87–90. [https://www.jstor.org/stable/23728247]</p>
<p>Newman, M., Ketphanh, S., Svengsuksa, B., Thomas, P., Sengdala, K., Lamxay, V. & Armstrong, K. (2007) <em>A checklist of the vascular plants of Lao PDR</em>. Royal Botanic Garden, Edinburgh, 394 pp.</p>
<p>Pridgeon, A.M., Cribb, P.J., Chase, M.W. & Rasmussen, F. (2014) <em>Genera orchidacearum</em>, volume 6, Epidendroideae (part three)<em>.</em> Oxford University Press, Oxford. 544 pp.</p>
<p>Schuiteman, A. & Bonnet, P. (2009) <em>Holcoglossum calcicola</em> und <em>Paphiopedilum barbigerum</em> var. <em>sulivongii</em>: zwei attractive neue Orchideen der Kalksteinberge von Laos. <em>Orchideen</em> <em>Journal</em> 16: 1–8.</p>
<p>Schuiteman, A., Bonnet, P., Svengsuksa, B. & Barthelémy, D. (2008) An annotated checklist of the Orchidaceae of Laos. <em>Nordic Journal of Botany</em> 26: 257–316.</p>
<p>Schuiteman, A., Sulivong, L.A. & Iio, S. (2018) <em>Paphiopedilum papilio-laoticus</em> (Orchidaceae), a new species from Laos. <em>Orchideen Journal</em> 6: 3–5.</p>
<p>Souvannakhoummane, K., Kumar, P., Gale, S.W., Lanorsavanh, S. & Lamxay, V. (2018) Three new additions to the orchid flora of Lao PDR. <em>Thai Journal of Botany</em> 10: 145–151.</p>
<p>Souvannakhoummane, K., Lanorsavanh, S., Rakthai, P., Kumar, P. & Gale, S.W. (2021) <em>Cymbilabia sourioudongii</em> (Orchidaceae), a new species from Lao PDR. <em>Rheedea</em> 31: 186–190. https://dx.doi.org/10.22244/rheedea.2021.31.03.08</p>
<p>Svengsuksa, B. & Lamxay, V. (2005) <em>Field guide to the orchids of Lao PDR</em>. National University of Lao PDR,Vientiane, 185 pp.</p>
<p>Swartz, O. (1799) Dianome epidendri generis Linn. <em>In:</em> <em>Nova</em> <em>Acta Regiae Societatis Scientiarum Upsaliensis</em>, 2nd ser, part 6. Edman, Uppsala, pp. 61–88.</p>
<p>Thouars, L.M.A. (1822) <em>Histoire particulière des plantes orchidées recueillies sur les trois iles australes d’Afrique, de France, de Bourbon et de Madagascar</em>. Bertrand, Paris, tab. 93.</p>
<p>Tordoff, A.W., Bezuijen, M.R., Duckworth, J.W., Fellowes, J.R., Koenig, K., Pollard, E.H.B. & Royo, A.G. (2011) <em>Ecosystem profile: Indo-Burma biodiversity hotspot</em>. Critical Ecosystem Partnership Fund, 360 pp.</p>