I.Symbioses between Microorganisms 1.Lichens地衣 A symbiosis of a fungus and an algaei藻类与真 菌的共生体 Often found growing on bare rocks,tree trunks,house roofs,and the surfaces of bare soils Sensitive to air pollution (as a indicator) 2 Microbiology,Shanghai Jiao Tong University2 Microbiology, Shanghai Jiao Tong University 1. Lichens地衣 A symbiosis of a fungus and an algae藻类与真 菌的共生体 Often found growing on bare rocks, tree trunks, house roofs, and the surfaces of bare soils Sensitive to air pollution (as a indicator) I. Symbioses between Microorganisms