Lichen growing on the branch of a tree. Lichens are symbiotic organisms formed of a fungus and an alga that mutually benefit one another. The alga is contained within the hyphae (filaments) of the fungus. They are therefore protected from harsh conditions,and in particular from dessication. The alga supplies the fungus with nutrients that it makes by photosynthesis. Lichens are usually found growing on stones and the bark of trees | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Gustoimages |
Taille de l’image : | 4992 px × 3328 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |