![](http://www.alamy.com/thumbs/6/C5CC37ED-CF11-4DD6-9314-5ED17264E35C/CN787M.jpg)
lichen on birch bark
lichen
Size: 4942px × 3437px
Photo credit: © Scott Camazine / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: alga, cynanobacterium, fungus, lichen, mycobiont, nostoc, partner, photobiont, photosynthetic, phycobiont, plant, symbiosis, symbiotic, trebouxia