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Spanish moss
Spanish moss grows freely on many trees in the southeastern US. It typically does no harm to the tree because it grows on branches, not inside the branches. It steals nothing but sunlight from the tree. Declining trees with abundant spanish moss are probably declining from some other factor, not the moss.
When the spanish moss become thick, enough sunlight can be blocked to slow growth on shaded leaves but most trees can outgrow the moss. Have an arborist remove the moss by hand if you do not like the way it looks. It is likely to grow back after some time. Click here for much more detail.
