See below .
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; hence the name "imperfect fungi." The phylogenetic line can be traced back to the point where these species hoard some of the rudimentary characteristics that could imply information sufficient to redirect them into the known and confirmed taxon. Only their asexual form of reproduction is known, meaning that this group of fungi produce their spores asexually, in the process called sporogenesis .
There are about 25,000 species that have been classified in the
deuteromycota and many are basidiomycota or ascomycota anamorphs .
Other, more informal names besides Deuteromycota ("Deuteromycetes") and fungi imperfecti are ANAMORPHIC FUNGI, or MITOSPORIC FUNGI, but these are terms without taxonomic rank. Examples are Alternaria, Colletotrichum, Trichoderma etc.
* 1 Problems in taxonomic classification * 2 Phylogeny and taxonomy * 3 Historical classification of the imperfect fungi
* 4 Common species
* 4.1 Industrially relevant fungi
* 5 See also * 6 References * 7 Bibliography
PROBLEMS IN TAXONOMIC CLASSIFICATION
Mycologists are unique among those who study extant organisms in using a dual system of nomenclature. Dual naming was permitted by Article 59 of the International Code of Botanical Nomenclature (which governs the naming of plants and fungi); however, this was abolished in the 2011 update of the Code.
Under the former system, a name for an asexually reproducing fungus
was considered a form taxon. For example, the ubiquitous and
industrially important mold,
PHYLOGENY AND TAXONOMY
Phylogenetic classification of asexually reproducing fungi now commonly uses molecular systematics . Phylogenetic trees constructed from comparative analyses of DNA sequences , such as rRNA , or multigene phylogenies may be used to infer relationships between asexually reproducing fungi and their sexually reproducing counterparts. With these methods, many asexually reproducing fungi have now been placed in the tree of life. However, because phylogenetic methods require sufficient quantities of biological materials (spores or fresh specimens) that are from pure (i.e., uncontaminated) fungal cultures, for many asexual species their exact relationship with other fungal species has yet to be determined. Under the current system of fungal nomenclature, teleomorph names cannot be applied to fungi that lack sexual structures. Classifying and naming asexually reproducing fungi is the subject of ongoing debate in the mycological community.
HISTORICAL CLASSIFICATION OF THE IMPERFECT FUNGI
These groups are no longer formally accepted because they do not adhere to the principle of monophyly . The taxon names are sometimes used informally. In particular, the term 'hyphomycetes' is often used to refer to molds, and the term 'coelomycetes' is used to refer to many asexually reproducing plant pathogens that form discrete fruiting bodies.
Following, a classification of the
* Class Hyphomycetes lacking fruiting bodies
* Order Moniliales (producing spores on simple conidiophores ) * Order Stilbellales (producing spores on synnemata ) * Order Tuberculariales (producing spores in sporodochia )
* Class Coelomycetes spores produced in fruiting bodies
* Order Melanconiales (producing spores in acervuli ) * Order Sphaeropsidales (producing spores in pycnidia )
* Class Agonomycetes lacking spores
Other, according to Dörfelt (1989):
* Form-Klasse: Hyphomycetes
* Form-Ordnung: Agonomycetales
* Form-Familie: Agonomycetaceae
* Form-Ordnung: Moniliales
* Form-Familie: Moniliaceae * Form-Familie: Dematiaceae * Form-Familie: Stilbellaceae * Form-Familie: Tuberculariaceae
* Form-Klasse: Coelomycetes
* Form-Ordnung: Melanconiales
* Form-Familie: Melanconiaceae
* Form-Ordnung: Sphaeropsidales
* Form-Familie: Sphaeropsidaceae
Other systems of classification are reviewed by Kendrick (1981).
INDUSTRIALLY RELEVANT FUNGI
* Tolypocladium inflatum → from which the immunosuppressant
ciclosporin is obtained;
* Other species of Penicillium are used to improve both the taste
and the texture of cheeses
* ^ "International Code of Nomenclature for algae, fungi, and plants". International Association for Plant Taxonomy. * ^ Dörfelt, Heinrich (Hrsg.): Lexikon der Mykologie. Gustav Fischer Verlag, Stuttgart, New York. 1989. * ^ Kendrick, B. (1981). The history of conidial fungi. In: BIOLOGY OF CONIDIAL FUNGI, pp. 3-18; G.T. Cole and B. Kendrick, eds., Academic Press, . * ^ See "Una Historia Ilustrada del Transplante de Órganos" (in Spanish ). * ^ See the following link (in Spanish ). * ^ "Bio-Cat Products". Bio-Cat. * ^ "ARS en Espanol : News & Events". USDA. * ^ Enzyme Development Corporation * ^ See this link (in Spanish ). * ^ Cf. (in Spanish ).
* Gams, W. 1995. How natural should anamorph genera be? Canadian Journal of Botany 73 (suppl 1):S747-S753. * Kendrick, B. 1981. The history of conidial fungi, Pages 3–18 in GT Cole and B Kendrick, eds. Biology of Conidial Fungi. New York, Academic Press. * Seifert, KA. 1993. Integrating anamorphic fungi into the fungal system, Pages 79–85 in DR Reynolds, and JW Taylor, eds. The Fungal Holomorph: mitotic, meiotic and pleomorphic speciation in fungal systematics. Wallingford, UK, CAB International. * Taylor, JW. 1995. Making the Deuteromycota redundant: a practical integration of mitosporic and meiosporic fungi. Canadian Journal of Botany 73 (suppl 1):S754-S759.
* v * t * e
Domain Archaea Bacteria Eukaryota (Supergroup Plant
Hacrobia Heterokont Alveolata Rhizaria Excavata Amoebozoa
Ascomycota (sac fungi)
Basidiomycota (with basidia )
Zoosporic fungi (paraphyletic)
Fungal phyla are underlined. See also: fungi imperfecti (polyphyleti