lichens are symbiotic associations of fungi and
What is a Lichen? Lichens are the symbiotic association of a fungus and an alga. Most lichen-forming fungi are members of the ascomycetes, the fungal group that includes the destructive bread molds, the edible morels, and the commercially-important baking and brewing yeast.hat is a Lichen? Lichens are the symbiotic association of a fungus and an alga. Most lichen-forming fungi are members of the ascomycetes, the fungal group that includes the destructive bread molds, the edible morels, and the commercially-important baking and brewing yeast.