Abstract
Odontochilus putaoensis, a new species of Orchidaceae, is described and illustrated from Putao Township, Kachin State, Myanmar. Odontochilus putaoensis is close to O. duplex, but can be easily distinguished from the latter by having a light yellow lip, a bisaccate hypochile with a small, erect, blade-like and emarginate callus within each sac, a mesochile with a pair of dentate-pectinate flanges and a bilobed epichile with a pair of widely diverging lobes that are erect and concave. An identification key to the Southeast Asian species of Odontochilus and colour photographs of O. putaoensis are provided. A preliminary conservation assessment according to the IUCN Red List Categories and Criteria is given for the new species.
Highlights
Odontochilus Blume (1858) (Orchidaceae, Orchidoideae, Cranichideae) consists of approximately 40 species, distributed from tropical Asia, Pacific islands to Japan, subtropical mainland Asia and eastern Himalayas (Pridgeon et al 2003, Chen et al 2009, Pedersen et al 2011, Chase et al 2015, Tang et al 2016)
Odontochilus is distinguished from Anoectochilus by its saccate and non-extruded spur enclosed by the lateral sepals and two parallel stigma lobes positioned under the rostellum, whereas Anoectochilus has a conical spur extruded beyond the lateral sepals and two remote stigma lobes (Lin and Hsu 1976, Pridgeon et al 2003, Chen et al 2009, Pedersen et al 2011)
Odontochilus putaoensis is similar to O. duplex, but can be distinguished from the latter by having a light yellow lip composed of a bisaccate hypochile with a small, erect, blade-like and emarginate callus within each sac, a mesochile with a pair of dentate-pectinate flanges and bilobed epichile with a pair of widely diverging lobes that are erect and concave
Summary
Odontochilus Blume (1858) (Orchidaceae, Orchidoideae, Cranichideae) consists of approximately 40 species, distributed from tropical Asia, Pacific islands to Japan, subtropical mainland Asia and eastern Himalayas (Pridgeon et al 2003, Chen et al 2009, Pedersen et al 2011, Chase et al 2015, Tang et al 2016). The generic delimitation of Odontochilus has been confused for a long time with its relative Anoectochilus Blume (1825). As both genera share some floral characters such as pectinate mesochile, ventral column wings and two stigma lobes, they were usually considered as one genus (Lang 1999, Pridgeon et al 2003). In the continental part of southeast Asia, there are nine species of Odontochilus (Seidenfaden 1992, Schuiteman et al 2008, Chen et al 2009, Pedersen et al 2011, Kurzweil and Lwin 2014, Averyanov et al 2015, Tang et al 2016). During our fieldwork in Putao Township, Kachin State, northern Myanmar, in October 2014, a new species of Odontochilus was discovered and is described below
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