DIVISION DEUTEROMYCOTA PDF

The division Deuteromycota is also called the Fungi Imperfecti or Imperfect Fungi referring to our "imperfect" knowledge of their complete life cycles. Asexual reproduction is by means of conidia sing. A conidium may be defined as an asexual spore that is not produced in a sporangium. Where sexual reproduction has been determined for species in this taxon, the sexual stage is usually referrable to the Ascomycota or Basidiomycota. Ideally, once the sexual stage has been determined, that species should be reclassified and placed in the appropriate subdivision.

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Imperfect fungi—those that do not display a sexual phase—are classified in the form phylum Deuteromycota. Deuteromycota is a polyphyletic group where many species are more closely related to organisms in other phyla than to each other; hence it cannot be called a true phylum and must, instead, be given the name form phylum. Since they do not possess the sexual structures that are used to classify other fungi, they are less well described in comparison to other divisions.

Most members live on land, with a few aquatic exceptions. They form visible mycelia with a fuzzy appearance and are commonly known as mold. Molecular analysis shows that the closest group to the deuteromycetes is the ascomycetes. Figure 1. Aspergillus niger is an imperfect fungus commonly found as a food contaminant.

The spherical structure in this light micrograph is a conidiophore. Reproduction of Deuteromycota is strictly asexual and occurs mostly by production of asexual conidiospores Figure 1. Some hyphae may recombine and form heterokaryotic hyphae. Genetic recombination is known to take place between the different nuclei.

Imperfect fungi have a large impact on everyday human life. The food industry relies on them for ripening some cheeses. The blue veins in Roquefort cheese and the white crust on Camembert are the result of fungal growth.

The antibiotic penicillin was originally discovered on an overgrown Petri plate, on which a colony of Penicillium fungi killed the bacterial growth surrounding it. Many imperfect fungi cause serious diseases, either directly as parasites which infect both plants and humans , or as producers of potent toxic compounds, as seen in the aflatoxins released by fungi of the genus Aspergillus. Skip to main content. Module 6: Fungi. Search for:.

Deuteromycota: The Imperfect Fungi Imperfect fungi—those that do not display a sexual phase—are classified in the form phylum Deuteromycota. Licenses and Attributions. CC licensed content, Shared previously.

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Fungi imperfecti

The fungi imperfecti or imperfect fungi , also known as Deuteromycota , are fungi which do not fit into the commonly established taxonomic classifications of fungi that are based on biological species concepts or morphological characteristics of sexual structures because their sexual form of reproduction has never been observed. Only their asexual form of reproduction is known, meaning that these fungi produce their spores asexually, in the process called sporogenesis. There are about 25, species that have been classified in the deuteromycota and many are basidiomycota or ascomycota anamorphs. Fungi producing the antibiotic penicillin and those that cause athlete's foot and yeast infections are algal fungi. In addition, there are a number of edible imperfect fungi, including the ones that provide the distinctive characteristics of Roquefort and Camembert cheese. Other, more informal names besides Deuteromycota "Deuteromycetes" and fungi imperfecti are anamorphic fungi , or mitosporic fungi , but these are terms without taxonomic rank.

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Division Deuteromycota (imperfect fungi)

Imperfect fungi—those that do not display a sexual phase—are classified in the form phylum Deuteromycota. Deuteromycota is a polyphyletic group where many species are more closely related to organisms in other phyla than to each other; hence it cannot be called a true phylum and must, instead, be given the name form phylum. Since they do not possess the sexual structures that are used to classify other fungi, they are less well described in comparison to other divisions. Most members live on land, with a few aquatic exceptions. They form visible mycelia with a fuzzy appearance and are commonly known as mold. Molecular analysis shows that the closest group to the deuteromycetes is the ascomycetes. Figure 1.

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Biology Mycology D. Ebtihal Muiz Division:Deuteromycota The division Deuteromycota is also called the Fungi Imperfecti or Imperfect Fungi referring to our "imperfect" knowledge of their complete life cycles. Asexual reproduction is by means of conidia sing. A conidium may be defined as an asexual spore that is not produced in a sporangium. Where sexual reproduction has been determined for species in this taxon, the sexual stage is usually referrable to the Ascomycota or Basidiomycota. Ideally, once the sexual stage has been determined, that species should be reclassified and placed in the appropriate subdivision.

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