Corunastylis densa is a terrestrial, perennial, deciduous, herb with an underground tuber and a single thin leaf 60–80 mm (2–3 in) long and fused to the flowering stem with the free part 6–12 mm (0.2–0.5 in) long.

[1] The dense midge orchid was first formally described in 1885 by Robert D. FitzGerald who gave it the name Prasophyllum densum and published the description in Journal of Botany, British and Foreign.

[4] The specific epithet (densa) is a Latin word meaning "thick" or "close".

[5] The World Checklist of Selected Plant Families lists C. densa as a synonym of Genoplesium nudiscapum.

[6] Corunastylis densa grows in a range of habitats between Point Lookout in New South Wales and the Moroka River in Victoria but is absent from the Snowy Mountains and the Australian Capital Territory.