Lichens growing on the bark of cut logs which have been left for several years. Lichens comprise an alga and a fungus living in partnership. The alga,confined to a layer of single cells in the main body of the fungus,produces nutrients for the lichen by photosynthesis. Lichens grow on a variety of substrates,from bare rock in Arctic regions to tree trunks in forests | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 5243 px × 3559 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |