Hmmm....
I'm going to drop my 2-cents in here.
There is a difference between mounting orchids in a living tree and mounting orchids on harvested wood/branches.
Most types of harvested wood should do fine, as long as any sap, resin, etc. has had time to bleed out or dry up.
I have mounted orchids in living Ficus benjamina.
I had to cut up and depose of one and was able to save the Dendri I had growing in it.
For a couple days after cutting up the tree, the branches with the Dendri experienced a pretty good amount of latex(?) bleeding.
Thankfully it didn't bother the Dendri very much.
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