lichens, nature, nature|trees, photography home » Archives for January 24, 2017 Sunburst Lichen on Valley Oak first published January 24, 2017 & last updated February 3, 2017 Gary Valle Click on thumbnails for more info & larger image. Colorful sunburst lichen on a valley oak in Upper Las Virgenes Canyon Open Space Reserve. Might be Xanthoria tenax.