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| Thismia perlisensis Besi & Rusea, in Besi, Jabar, Rahman, Saad, Ahmadni et Go, 2024. |
Abstract
A new species, Thismia perlisensis, found during a scientific expedition in the Perlis State Park, is described and illustrated. The new species was discovered in a wetland forest on a limestone foothill. Morphological description, photographic data including habitat, and a key to the species of the Thismia Sect. Thismia Subsect. Brunonithismia recorded from Malaysia are provided. The new species is easily distinguished from the similar species, T. arachnites, T. javanica, T. tentaculata, and T. kenyirensis by the prominent reddish dome-shaped annulus instead of ring-like with rim, deeply trilobed stigma with bifid and subulate lobes, and claviform apices of the inner tepals.
Key words: THISMIACEAE, endemism, mycoheterotrophic plants, Perlis state, Peninsular Malaysia, plant diversity, Monocots
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| Thismia perlisensis in the wild. Images by Edward Entalai Besi and Muhamad Ikhwanuddin Mat Esa. |
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| Flower’s dissection of Thismia perlisensis. A. Plant. B. Flower. C. Claviform apex of an inner tepals. D. Dome-shaped annulus. E. Stamens and pistil. F. Stamens. G. Anther thecae. H. View of the supraconnectives. I, J. Pistil with stigmas straightened showing subulate lobes. B–J spirit-preserved specimens. Images by Edward Entalai Besi. |
Thismia perlisensis Besi & Rusea sp. nov.
Type:—MALAYSIA. Peninsular Malaysia: Perlis State, Perlis State Park, ca. 100 m elev., 4 October 2022, E.E. Besi, M.I. Mat Esa, S.H. Tan, D. Sandin & R. Go EDW136 (holotype UPM spirit collection).
Diagnosis:—Thismia perlisensis can be easily distinguished from the Thismia arachnites Ridley (1905: 197) and Thismia javanica J.J.Sm. (1910: 32) by the blood-red, dome-shaped annulus (vs. ring-like with rim, orange annulus), prominent trilobed stigma with 1.8 mm long, bifid and subulate lobes (vs. ovate, truncate stigma), and claviform apices of appendages of the inner tepals (vs. subulate apices of appendages of the inner tepals).
Etymology:—The specific epithet is named after Perlis State, the type locality of this species.
Edward Entalai Besi, Qistina Anis Mad Jabar, Syamil Abd Rahman, Mohd Zulkifly Saad, Ag Shaffie Ag Ahmadni and Rusea Go. 2024. Thismia perlisensis (Thismiaceae), A New red-annulus Thismia Species from Peninsular Malaysia. Phytotaxa. 675(1); 1-10. DOI: doi.org/10.11646/phytotaxa.675.1.1 [2024-12-02]
