Lichen
Lichen
Lichens are a symbiosis of a fungus and one or more photosynthetic partners, typically a green alga (see Protists) and/or cyanobacterium (see Bacteria). Lichen taxonomy is based on the fungal partner, and reflects the lichen body displays characteristics that are unique from the fungus or photosynthesizer alone. Lichens grow on bare rock, trees, and soil surfaces.