Nematoceras
 Nematoceras is a genus of orchids (family Orchidaceae) sometimes known as spider orchids helmet orchids or spidery helmet-orchids found mainly in New Zealand and its subantarctic islands with two species on Australia’s Macquarie Island. The genus was absorbed by Corybas for a long period before being reinstated but now it is accepted back into Corybas. Such is the nature of the turmoil in orchid taxonomy.