DIVISION DEUTEROMYCOTA PDF

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.

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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.

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Division Deuteromycota (imperfect fungi)

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. However, this did not prove to be practical since many species are known best by their asexual stage. Thus, a compromise was reached and both the asexual and sexual stage are recognized.

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Fungi imperfecti

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. However, this did not prove to be practical since many species are known best by their asexual stage.

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