Today I have been out photographing lichen. Did you know there are over 17,000 species of it! Some of the most common and well known are: oak moss, tree lungwort, cladonia fimbriata and wolf lichen. Lots of birds use lichen as camouflage in their nests – especially long-tailed tits. It can grow on trees, fallen branches and rocks. I used my Nikon D90 camera and Sigma 105mm macro lens to snap these photos!