Talk about Ascomycetes.

Sometimes referred to as sac fungi because their spores (Ascospores) are produced in little sacs called asci, asci are always the terminal cells of special hyphae. They are usually located in reproductive structure called ascocarp (carpophore) The end cells (asci) of the ascus bearing hyphae ,in many forms, line the inner surface of the ascocarp, this surface layer is called hymenium or fertile layer. Sterile cells, called paraphyses also arise in the hymenium and are more numerous than asci Hymenial layer is more or less surrounded by the vegetative haploid hyphae that form a layer called peridium. The mycelium is composed of segmented and perforated hyphae, which allows the cytoplasm to switch from one cell to another Ascomycetes are terrestrial or aquatic which are saprophytes. Many sexually reproducing yeasts are Ascomycetes ( edible morels, truffles, red brown and blue green ones degrade food, some cause plant diseases other are important economically.