“deuteromycetes” or Fungi Imperfecti, have no known sexual state in their life cycle.
Most of these have affinities to Ascomycota.
When the teleomorph is discovered, the technically correct name for the fungus is that of the teleomorph.
~1680 genera and 17,000 species classified here.
The large majority of these fungi are terrestrial, and are either saprobes or parasites of plants -- relatively few are parasites of animals
Some further information on deuteromycetes.