These are specialized lifestyles have evolved independently in the zygote fungi (Zygomycota), sac fungi (Ascomycota), and the club fungi (Basidiomycota). Ecological Diversity We commonly divide fungi into groups based on an ecological context as follows: molds, yeasts, lichens, and mycorrhizae These groups have evolved morphological and ecological adaptations for specialized ways of life
As noted some molds have no known sexual stages and cannot be classified as zygomycetes, ascomycetes, or basidiomycetes because they have no known sexual stages. Collectively fungi with no known sexual stages are grouped as deuteromycetes, or imperfect fungi, these fungi reproduce asexually by producing haploid spores. This is an informal grouping without phylogenetic basis.
Fungi are commercially important Fungi and bacteria are the principle decomposers that keep ecosystems stocked with the inorganic nutrients essential for plant growth. –Without decomposers, carbon, nitrogen, and other elements would become tied up in organic matter. On the other hand, the aggressive decomposition by fungi can be a problem. –Between 10% and 50% of the world’s fruit harvest is lost each year to fungal attack. –Fungi do not distinguish between wood debris and human structures built of wood.