SUMMARY: Thelymitra lucida (glistening sun-orchid) is a deciduous terrestrial orchid known in Tasmania from two locations in the south of the State, with only two records, despite numerous surveys in known and potential habitat. The species is typically rare and seldom collected and it is likely that the species occupies less than 1 ha and consists of fewer than 250 individuals in total in Tasmania, putting the species at a high risk of local extinctions due to the small size of sites. The species grows in swampy areas in open forest and woodland. Likely threats to the known sites include losses through vegetation clearance or land management changes, competition from weeds, inappropriate fire or disturbance regimes and climate change.