Joshua Tree National Park:
Lichen
Joshua Tree National Park:
Lichen-covered rocks
Joshua Tree National Park:
Lichen
Joshua Tree National Park:
Lichen
Joshua Tree National Park:
Lichen on a rock
Joshua Tree National Park:
Lichen survey
Joshua Tree National Park:
Students surveying lichen
Joshua Tree National Park:
Student observes lichen
Joshua Tree National Park:
Student surveying lichen
Joshua Tree National Park:
Ranger and student surveying lichen
Joshua Tree National Park:
Student looks through lichen ID guide
Joshua Tree National Park:
Snowfall on 12/31/14 - Icicles and lichen on Barker Dam trail