This is a picture of fungi and alga on a tree. Note that the lichen in the picture above is not the plant growing on the left side, but rather it is the light green, dark green, and yellow mix of fungi and alga. This is an example of a lichen. A lichen is a slow growing group of fungi and alga that usually form leaf like or branching growth on rocks, trees, and etc. Lichen have a mutualistic relationship with the tree or rock that they grow on which means that both the fungi and alga and tree/rock benefit. Fungi and alga can be seen as partners in crime who come together and form a lichen.
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