Xanthomendoza fallax (Hooded Sunburst lichen) is a small yellow-orange to red-orange foliose (leaf-like) lichen that grows on bark, rarely on rock, all over the world except very dry areas. Another excellent city-dweller, Hooded Sunburst is found coating the trunks of various tree species in urban parks and boulevards.  Look closely to see the crescent shaped openings that disperse grains of fungi and algae, ready to colonize new habitats.