If you hold a branch of this lichen between your fingers & flip it top up, bottom up a few times, you'll see that one side is clearly paler than the other. Species of Parmeliopsis are small, and grow very tightly appressed to the substrate. Plus they don't like the lowlands.
sgene
2014-12-21
2014-12-21 16:19:44
United States of America, California, Folsom Lake SRA, CA, US