This growing-together & melting-into-one-another of tree branches is called “inosculation”, from the Latin osculare, to kiss. An arboreal en-kissing, then, that can make it hard to say where one being ends & another begins.
Pillar-like aerial roots support a massive spreading limb of a Lord Howe Island Banyan (Ficus macrophylla ssp. columnaris) at the San Diego Zoo. In its native habitat, a single tree of this species can cover one acre of land.