Wherever stable and reasonably well lit surfaces occur in nature, so will lichens. A bizarre partnership of fungus and algae, lichens will grow on soil, rock, and even trees. Although they give the appearance of being parasitic on their vegetative hosts, lichens are anything but, being self-reliant in feeding themselves through photosynthesis in their algal cells. The algae, in turn, benefits from the ability of the fungus to better find, soak up, and retain water and nutrients.
Did You Know?
The Union siege lines and Confederate defensive lines were marked during the first decade of the 20th century by many of the veterans who fought at Vicksburg, thus making Vicksburg National Military Park one of the most accurately marked military parks in the world.