Galeandra?
At least one Galeandra species (Galeandra lacustris), despite described as epiphitic in IOSPE, grows in annually flooded grounds (Brazil, Ecuador, Peru, Colombia, Bolivia); I never saw this species; perhaps it survives on submerged/partially submerged branches, part of the year.
But I think the 'mystery plant' is an Habenaria.
Frederico
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