Nematoceras dienemum , also known as the windswept helmet-orchid, is one of two helmet orchids endemic to Australia’s subantarctic Macquarie Island, and the first orchid to be found there. It was discovered in 1978 and identified as Corybas macranthus, then split off and described by David Jones in 1993 as a new species, Corybas dienemus (from Greek dienemos - “windswept”). In 2002 it was placed in the reinstated genus Nematoceras.