New Thismia daemona described from single Thai population in PhytoKeys study

The team conducted targeted field surveys across elevation gradients in western Thailand, locating the leafless mycoheterotroph beneath leaf litter at approximately 1,000 m. Morphological examination of flowers, including the black miter with horn-like appendages and reddish-orange basal patches, distinguished it from congeners previously restricted to Peninsular Malaysia, Borneo and Sumatra. The description was published in PhytoKeys after comparison with type specimens and molecular data from related Thismia species.

Only one small population is documented, prompting a provisional Critically Endangered assessment. Tourism pressure within the national park and the plant’s dependence on specific fungal partners create acute vulnerability. Community-based monitoring aligned with UNESCO Man and the Biosphere principles is proposed to reduce trampling while supporting local stewardship.

This discovery highlights how mycoheterotrophic plants can occupy unexpected seasonal habitats and underscores the value of systematic surveys in under-sampled Southeast Asian forests. Similar range extensions may emerge once comparable high-elevation sites receive equivalent search effort.

Future work requires repeated censuses and fungal-barcode sampling to test whether the current site represents an isolated outlier or part of a larger unrecognized distribution.