![Lichen colonies](images/media/library_023_lg.jpg)
Lichens—a mutually beneficial marriage of fungi and algae—build soil in some of the Earth’s most extreme environments. © Wayne P. Armstrong, Palomar College (waynesword.palomar.edu)
Lichens—a mutually beneficial marriage of fungi and algae—build soil in some of the Earth’s most extreme environments. © Wayne P. Armstrong, Palomar College (waynesword.palomar.edu)