Lichens on a tree. Two types of lichen growing on a tree trunk. Lichens are mutualistic (beneficial) associations between a fungus and an alga,the alga occupying a single layer of cells within the body of the fungus. They are found growing on the surfaces of trees and rocks. On trees they are epiphytes: they live on,but do not harm,their host. Seen here is Parmelia sulcata (upper frame,blueish-green),common throughout the northern temperate zone. Also pictured is Rinodina roboris (centre,blue) | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Fleming, Vaughan |
Bildgröße: | 3522 px × 5020 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |