Spanish moss (Tillandsia usneoides) closely resembles its namesake (Usnea, or beard lichen). However, Spanish moss is not biologically related to either mosses or lichens. Instead, it is a flowering plant in the family Bromeliaceae (the bromeliads) that grows hanging from tree branches in full sun or partial shade. Formerly ; this plant has been placed in the genera Anoplophytum,Caraguata and Renealmia. It ranges from the southeastern United States (Southern VA and eastern MD) to Argentina, growing wherever the climate is warm enough and has a relatively high average humidity.
The plant consists of a slender stem bearing alternate thin, curved or curly, heavily scaled leaves 2-6 cm long and 1 mm broad, that grow vegetatively in chain-like fashion (pendant) to form hanging structures 1-2 m in length, occasionally more. The plant lacks roots and its flowers are tiny and inconspicuous. It propagates both by seed and vegetatively by fragments that blow on the wind and stick to tree limbs, or are carried by birds as nesting material.
It can grow so thickly on tree limbs that it gives a somewhat "gothic" appearance to the landscape, and while it rarely kills the trees it lowers their growth rate by reducing the amount of light to a tree's own leaves. It also increases wind resistance, which can prove fatal to a tree in hurricanes. _Wikipedia