Abstract
A new species, Corybaspapillatus, is described and illustrated from peninsular Thailand. The new species is easily recognized through a combination of the following characters: the purplish flower, the rounded apex of the dorsal sepal, the outer surface of dorsal sepal covered with irregular papillae in the upper half, the lateral sepals adnate laterally at the base to the connate petals, the V-shaped throat, the labellum bearing short hairs, dentate to erose labellum margins, and well-developed conical spurs. A key to the species of Corybas in Thailand is presented.
Highlights
Corybas papillatus is most similar to C. villosus, which is endemic to Peninsular Malaysia (Dransfield et al 1986; Go et al 2015)
These two species share several common features, viz. flower coloration being purplish, the dorsal surface of dorsal sepal covered with irregular papillae in the upper half, the hairiness of the labellum, the V-shaped throat, irregularly dentate to erose labellum margins, and well-developed conical spurs
Corybas papillatus is distinguished from C. villosus by lacking dorsal sepal keel and the adnate lateral sepals and connate petals
Summary
Two Corybas species are currently known from Thailand, namely Corybas ecarinatus Anker & Seidenf. (Anker and Seidenfaden 2001; Pedersen 2011), and C. geminigibbus J.J. Sm. During a recent visit to Khao Luang Mountain, Khao Luang National Park, by staff of BKF herbarium, an interesting taxon of the genus Corybas was collected with a unique combination of characters that did not match any of the known species. It is described here as a species new to science
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