Thismia ornata and T. coronata (Thismiaceae), two new species from Sarawak (Malaysian Borneo) are described and illustrated. Thismia ornata belongs to T. sect. Thismia subsect. Odoardoa and occurs at several localities in western Sarawak around the city of Kuching. This species has been misidentified as T. aseroe until now, although the two species differ considerably. The species is assigned a preliminary conservation status of VU according to IUCN criteria. Thismia coronata belongs to T. sect. Sarcosiphon and has been found at only one site near the village of Long Tuyo in Lawas district of northern Sarawak. It is related to T. goodii and T. kelabitiana. The species is assigned a preliminary conservation status of CR.

Citation:Dančák M., Hroneš M. & Sochor M. 2020: Thismia ornata and T. coronata (Thismiaceae), two new species from Sarawak, Borneo. – Willdenowia 50: 65–76. doi:  https://doi.org/10.3372/wi.50.50106

Version of record first published online on 10 March 2020 ahead of inclusion in April 2020 issue.