Photographing your subject with your hand.
This is Usnea (松蘿) and it has medicinal uses. Commonly known as Old Man’s Beard.
Usnea is a indicator of very clean ambient air in the surroundings.
This plant is ultra sensitive to Sulfur Dioxide (SO2). The colourless gas is a byproduct through combustion route, such burning material made from sulfur.
So far, I only encountered Usnea twice in two different hike at about the same elevation of 1,600 meters above sea level.