Mycoheterotrophic Plants

How many of them are there?

How many species are there in the holomycotrophic genus Didymoplexis Grffi. (Orchidaceae) in Madagascar?

Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith