Hollow lobes, gray on top, black beneath, on wood = tube lichens! This one will be either H. apinnata or H. enteromorpha, and I am strongly inclined to the latter because of the lack of little side lobes and coastal location.
Donna Pomeroy
2014-12-22
2014-12-22 16:09:15
United States of America, California, Butano State Park, San Mateo, California, United States