Where did land plants come from?

More than 90% of land plants have symbiotic relationships with fungus and those relationships seem to date back hundreds of millions of years. At Topologic Oceans, Charles Soeder explains how this fact has become a jumping off point for an interesting theory about the evolution of land plants — maybe all the plants we see in our daily land-locked lives are the result of symbiotic blending of algae and fungus, similar to the way our own cells now depend on the offspring of a bacterial invasion in order to function.