Fungi which usually produce neither sexual (meiotic) nor asexual (mitotic) spores. These fungi have been denoted by various names. The most common names are Mycelia Sterilia (having sterile mycelium), Agonomycetales (used when classifying these fungi at the level of order), or Agonomycetes (used when assigning their rank at the level of class). These fungi make up an artificial (nonphylogenetic) group consisting of both ascomycetes and basidiomycetes. A few species have associated sexual states, but these sexual states are infrequently produced. Although true spores are mostly lacking in this group, some species produce sporelike structures which function effectively in survival and dispersal of the species. Some of these sporelike structures mimic true spores so well in form and function that the genera producing them (for example, Beverwykella, Cancellidium, and Tretopileus) have occasionally been classified with spore-forming fungi.