from The Century Dictionary and Cyclopedia
- n. An epiphytic plant, Tillandsia usneoides, with gray filiform stems and leaves, forming dense pendulous tufts which drape the forests of the southern United States. See Tillandsia. Also called longbeard, and more rarely and less appropriately black-moss, Spanish moss, and barba Hispanica.
Sorry, no etymologies found.
But every step met its obstacle; there were low boughs, festoons of long-moss, bushes, briers, brake-cane, mossy logs, snaky pools, and things half fallen and held dead.