The site has some stunning pictures of lichen. You will really be amazed at their beauty and diversity. In the The special biology of lichen section, lichens are defined. Here, the distinction is made between algae and cyanobacteria or what use to be called blue-green algae either of which or both can pair with a fungus to form lichens. There is a short section on how lichens reproduce and where they grow.
Lichens grow in unlikely spots such as bare rocks, deserts, dead wood or bark on a tree.
It states that lichens live practically in every conceivable habitat on earth, having been found on masonry, tombstones and statues, stained glass windows, and on the President's faces at Mount Rushmore National Memorial. Back to North American Lichen Project which boasts an excellent lichen picture gallery. Again, take your time and browse through the pictures and appreciate how beautiful, colourful and diverse lichens are. They are simply amazing. Lichens are listed by their Latin names, but a few have common names.