Usnea, also known as old man’s beard, is a type of lichen that grows on the trees, bushes, rocks, and soil of temperate and humid climates worldwide (1). It has long been used in traditional medicine.

Rachael has a degree in Zoology from the University of Southampton, and specializes in animal behavior, evolution, palaeontology, and the environment.View full profile Rachael has a degree in Zoology ...

A Spanish moss-like substance can be seen hanging from spruce trees around Summit County. There are a number of spruce trees in a cluster in Cucumber Gulch in Breckenridge, which has this growing on ...