When a fungus lacks the sexual phase (perfect stage) or if this phase has not been observed it is placed within the division Deuteromycota, commonly called as Deuteromycetes or Fungi imperfecti. Some are saprophytes or parasites while a large number of them are decomposers of litter and help in mineral cycling. The Deuteromycota are characterized by production of septate mycelium and/or yeasts, and a sexual life cycle that is either unknown or absent. The deuteromycetes have no known sexual (teleomorph) state and usually reproduce asexually (anamorph) by conidia. The deuteromycetes are commonly called fungi imperfecti, that is, “imperfect fungi.” Those fungi that lack a known sexual reproduction cycle are in the division Deuteromycetes. Most Deuteromycetes reproduce by means of Conidia. The mycelium is septate and branched. The deuteromycetes are no longer recognized as a valid taxonomic group. As far as we know, these fungi reproduce only by an asexual process. Genetic recombination is known to take place between the different nuclei. Sexual reproduction is accomplished in three distinct phases such as plasmogamy (protoplasmic fusion), karyogamy (fusion of nuclei), and meiosis (reduction division of zygote). Brown spot disease of rice is caused by helminthosporium oryzae, early blight of potato, tomato is caused by Alternaria and Fusarium causes vascular wilts. ----- Please refer to the following plates for characteristic structures in the Moniliales: Deuteromycota (Fungi Imperfecti): Moniliales . They may reproduce by simple budding or they may produce sterigmata with spores that are shot off forcibly (= ballistospores). There are some 25,000 species of Deuteromycota, or imperfect fungi, so called because their manner of reproduction is asexual and not understood. Most of them are parasitic and cause various diseases. Also called imperfect fungus. Except Deuteromycetes or fungi imperfecti, sexual reproduction is found in all groups of fungi. Because they have no known sexual (teleomorph) state, they cannot be placed with complete confidence in any of the phyla. The asexual spores are not found, vegetative reproduction occurs by fragmentation and sexual organs are absent. Sexual Reproduction is accomplished by the formation and fusion of gametes. Asexual reproduction is by means of conidia (sing.=conidium) or may be lacking. Deuteromycetes is a class of fungi that shows only asexual reproduction in their life cycle. The deuteromycetes reproduce only by asexual spores known as conidia. Despite its “-mycetes” ending the deuteromycetes are not a class; rather this term is now used as a common name for this dumping-ground group of fungi. Deuteromycetes. Reproduction of Deuteromycota is strictly asexual, occuring mainly by production of asexual conidiospores. (a) Phycomycetes (b) Ascomycetes (c) Basidiomycetes (d) Deuteromycetes. ⇒ Deuteromycota. d)Deuteromycetes (Fungi Imperfecti): In these fungi only asexual method of reproduction by means of conidia has been observed. The deuteromycetes, commonly called molds, are “second-class” fungi that have no known sexual state in their life cycle, and thus reproduce only by producing spores via mitosis, This asexual state is also called the anamorph state. … Answer. (When such an organism’s sexual stage is discovered, the fungus is usually reclassified.) Other variants cause fungal infection of the feet, jock itch and ringworm. Imperfect fungi have a large impact on everyday human life. Hence they are grouped under an artificial group called fungi imperfecti. cete (do͞o′tə-rō-mī′sēt′) n. Any of various fungi that reproduce only asexually, by means of conidia, or whose sexual stage has not yet been discovered. Some hyphae may recombine and form heterokaryotic hyphae. 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