The genus has hollow lobes. If you zoom in on your photo, you can see that the lobe tips have a slightly different color, and a more granular, powdery texture. This is the only species of Hypogymnia in CA that has those tips.
Robin Gwen Agarwal
2015-02-04
2015-02-04 12:10:01
United States of America, California, Foothills Park, Santa Clara, California, United States