<fungus> A subdivision of true fungi commonly known as cup or sac fungi. ... They reproduce asexually through externally-produced spores called conidia and sexually with the aid of specialised sacs called asci. This division includes yeasts, morels, truffles, powdery mildews, ergot and fungi responsible for other plant diseases such as chestn... Found on http://www.encyclo.co.uk/local/20973