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Issue: Vol. 715 No. 2: 19 Aug. 2025
Type: Article
Published: 2025-08-19
DOI: 10.11646/phytotaxa.715.2.2
Page range: 117-128
Abstract views: 713
PDF downloaded: 823

Thismia velaris and T. dasyantha, two new species of Thismia section Thismia subsect. Odoardoa (Thismiaceae) from Sarawak, Malaysia

Department of Ecology and Environmental Sciences, Palacký University, Šlechtitelů 27, CZ-77900 Olomouc, Czech Republic
Department of Botany, Palacký University, Šlechtitelů 27, CZ-77900 Olomouc, Czech Republic
Czech Agrifood Research Center, Šlechtitelů 29, CZ-77900 Olomouc, Czech Republic
Department of Ecology and Environmental Sciences, Palacký University, Šlechtitelů 27, CZ-77900 Olomouc, Czech Republic
Department of Botany, Palacký University, Šlechtitelů 27, CZ-77900 Olomouc, Czech Republic
Forest Biodiversity Division, Forest Research Institute Malaysia, 52109 Kepong, Selangor, Malaysia
Research & Development Division, Forest Department Sarawak, Kuching 93250, Sarawak, Malaysia
Borneo Dioscoreales mycoheterotrophy rainforest taxonomy Monocots

Abstract

Thismia velaris and T. dasyantha (Thismiaceae), two new species from Sarawak (Malaysian Borneo), are described. Key distinguishing features, particularly in floral structure, are highlighted through comparative morphological analyses accompanied by illustrations. Additionally, phylogenetic relationships are assessed using molecular data, and both newly described species are placed within the broader evolutionary framework of Thismia. Both species, being characterized by vermiform roots and six free tepals of equal shape and size, are classified within Thismia sect. Thismia subsect. Odoardoa. Preliminary conservation assessments, following IUCN Red List criteria, suggest that both species may be at risk due to their restricted distributions and potential habitat threats. Through the discovery of T. velaris and T. dasyantha, the diversity and biogeographical patterns of Thismia in Borneo are further elucidated, emphasizing the need for continued exploration and conservation efforts.

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How to Cite

Dančák, M., Hroneš, M., Sochor, M., Uvírová, A., Blažek, V.T., Yunoh, S.-M.M. & Yiing, L.C. (2025) Thismia velaris and T. dasyantha, two new species of Thismia section Thismia subsect. Odoardoa (Thismiaceae) from Sarawak, Malaysia. Phytotaxa 715 (2): 117–128. https://doi.org/10.11646/phytotaxa.715.2.2