pneumatophore การใช้

The pneumatophore forms at the opposite end to the mouth.
Unlike other mangrove species, it does not grow on pneumatophores that allow its roots to breathe even when submerged.
These root extensions are called pneumatophores, and are present, among others, in black mangrove and pond cypress.
These structures were initially thought to function as pneumatophores, but recent experiments have failed to find evidence for this hypothesis.
Now the question is why are this pneumatophores even form when the shoot of all these plants have arrangements to respirate quite efficiently?