On a first principles approach to Dendrophylax lindenii

[NatalieS]

They appear to be classified as "critically imperiled" accordng to their conservation status by NatureServe (as mentioned on wikipedia at least), so this is what I was considering when talking about their rarity.

I have no idea how they come up with or measure this, but yes, I agree that it may not tell the whole story.

And yes, agreed, their symbiotic neighbours may also play a much bigger role for a plant like this.