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| Corybas papillatus Inuthai, Chantanaorr. & Suddee, in Inuthai, Chantanaorrapint, Poopath, ... et Suddee, 2021. Photographs by W. Kiewbang. |
Abstract
A new species, Corybas papillatus, 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.
Keywords: Helmet orchid, Khao Luang National Park, montane forest, Thai-Malay Peninsula
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| Figure 2. Corybas papillatus Inuthai, Chantanaorr. & Suddee A whole plant with flower and tubers B plant with immature flower C mature flower, lateral view D plant with immature fruit E floral bract, F, G dorsal sepal F ventral view G lateral view H lateral sepals and petals I labellum J, K column, J lateral view, K front view. Drawn by J. Inuthai. |
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| Figure 1. Corybas papillatus Inuthai, Chantanaorr. & Suddee A, B plants in natural habitat, on humus associated with Bazzania sp. and Acroporium sp. C plant with immature fruit D, E flowers D front view E lateral view F immature flower G underground parts with tubers. Photographs by W. Kiewbang. |
Corybas papillatus Inuthai, Chantanaorr. & Suddee, sp. nov.
Diagnosis: Similar to Corybas villosus J. Dransf. & Gord. Sm., but differs in the absence of dorsal sepal keel and the lateral sepals adnate laterally at the base to the connate petals.
Habitat and ecology: The new species was found growing amongst bryophytes (Fig. 1A–C), such as Acroporium sp., Bazzania sp., and Schistochila aligera (Nees & Blume) J.B. Jack & Steph., on humus in shade in montane forest, ca. 1,700 m above sea level.
Distribution Corybas papillatus is only known from the type locality (Fig. 3), however, it may also occur in other areas in peninsular Thailand with similar vegetation type.
Etymology The specific epithet ‘papillatus’ alludes to occurrence of irregular papillae in upper portion of abaxial (dorsal) surface of dorsal sepal.
Janejaree Inuthai, Sahut Chantanaorrapint, Manop Poopath, Naiyana Tetsana, Wittawat Kiewbang and Somran Suddee. 2021. Corybas papillatus (Orchidaceae), A New Orchid Species from peninsular Thailand. PhytoKeys. 183: 1-7. DOI: 10.3897/phytokeys.183.71167
