Loads of disagreement here it seems. Starting at the end:
IPNI notes genus
Myrmecophila originally published in the
Orchid Review, 1917.
Tropicos notes
Myrmecophila sinuosa (without accepting) but note under Genus: *Myrmecophila Christ ex Nakai. The * means illegitimate,
(* = Illegitimate).
The Plant List references Tropicos (for M. sinuosa) as accepted, date supplied 2012-04-18.
Looking elsewhere.
Kew WCSP lists
Myrmecophila as a member of family Orchidaceae in agreement with IPNI
IPNI lists
Lecanopteris as members of family Polypodiaceae.
We have the COL referencing Kew for
Myrmecophila, as Orchids, (
Myrmecophila species).
and World Ferns for
Lecanopteris as ferns (Polypodiaceae), (
Lecanopteris species).
The COL also indicates the latest taxonomic review for
Lecanopteris sinuosa as Hassler M., 2013, more current than The Plant List reference.
and Myrmecophila sinuosa as a synonym.
I'd be inclined to go with Myrmecophila as an orchid genera and Lecanopteris as the fern. So Lecanopteris sinuosa as accepted.
This makes synonyms dicey.
What do you all think.
