- an epiphytic plant, Tillandsia usneoides, of the southern U.S., having narrow, grayish leaves and growing in long festoons that drape the branches of trees.
- an epiphytic bromeliaceous plant, Tillandsia usneoides, growing in tropical and subtropical regions as long bluish-grey strands suspended from the branches of trees
- a tropical lichen, Usnea longissima, growing as long trailing green threads from the branches of trees
