Lichens地衣 A mutalistic relationship between a fungus and an alga(or cyanobacterium)真菌与藻类（或蓝细菌) 的共生体 Alga is photosynthetic and produces organic matter The fungus provides a structure within which the phototrophic partner can grow protected from erosion 8 Microbiology,Shanghai Jiao Tong University8 Microbiology, Shanghai Jiao Tong University Lichens 地衣 A mutalistic relationship between a fungus and an alga (or cyanobacterium)真菌与藻类（或蓝细菌） 的共生体 • Alga is photosynthetic and produces organic matter • The fungus provides a structure within which the phototrophic partner can grow protected from erosion