Lichens are symbiotic associations between a fungus and algae. Most of these lichens consist of:

Step-by-step solution

The lichen fungus is typically a member of the Ascomycota rarely a member of the basidiomycota. The algal or cyanobacterial cells are photosynthetic, and as in higher plants they reduce atmospheric carbon dioxide into organic carbon sugars to feed both symbionts. Both partners gain water and mineral nutrients mainly from the atmosphere through rain and dust. The fungal partner protects the alga by retaining water, serving as a larger capture area for mineral nutrients and, in some cases, provides minerals obtained