From BonsaiWIKI
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Lichens)
Lichen growing in the branches of a tree
Lichen on the bark of a
Plum tree
are a symbiotic relationship between a fungus and an alga (algae). Lichens may grow on trees, rocks and soil. Their relationship with the substrate is not
parasitic: Lichens may absorb certain minerals but they are self sustaining. Lichens can become dormant to survive periods of drought and dehydration. They are, however, rather sensitive to pollution.
Links
- Introduction to lichens
- British Lichen Society
- American Bryological and Lichenological Society
- California Lichen Society
- North American Lichens
