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50.6 MB (3.7 MB compressed)
3522 x 5020 pixels
29.7 x 42.4 cm ⏐ 11.7 x 16.7 in (300dpi)
VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY VAUGHAN FLEMING / SCIENCE PHOTO LIBRARY
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).
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