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Related to Ascomycotina: Deuteromycotina, Ascomycota, Sac fungi


a phylum of the kingdom FungiFungi
, kingdom of heterotrophic single-celled, multinucleated, or multicellular organisms, including yeasts, molds, and mushrooms. The organisms live as parasites, symbionts, or saprobes (see saprophyte).
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A phylum in the kingdom Fungi, representing the largest of the major groups of fungi, and distinguished by the presence of the ascus, a specialized saclike cell in which fusion of nuclei and reduction division occur and the resulting nuclei form ascospores. In most ascomycetes, each ascus contains eight ascospores, but the number may vary from one to several hundred. In the simplest ascomycetes (yeasts), the vegetative body (thallus) is unicellular; however, in the majority of ascomycetes, the thallus is more complex and consists of a tubular, threadlike hypha with cross walls which grows in or on the substrate. These hyphae eventually form structures called ascomata (ascocarps), on or in which the asci are formed. In addition to their sexual reproduction, most ascomycetes reproduce asexually by means of conidia.

Traditionally, the structure of the ascoma and ascus has served as the basis for subdividing the Ascomycota into five classes: Hemiascomycetes, Plectomycetes, Pyrenomycetes, Discomycetes, Loculoascomycetes. The introduction of molecular data, however, is changing concepts of the relationships of different groups of ascomycetes and will eventually lead to a much-revised classification scheme.

The ascomycetes occur throughout the world in all types of habitats and on both living and dead substrates. An estimated 33,000 species are arranged in about 3300 genera, with new species being described regularly. Ecologically ascomycetes function as primary decomposers of plant materials, but they also are important as plant and human pathogens; in baking, brewing, and winemaking; in enzyme and acid production; and as sources of antibiotics and other drugs. See Eumycota, Fungi, Plant pathology, Yeast

McGraw-Hill Concise Encyclopedia of Bioscience. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Second, based on differential amplification using basidiomycete-specific primers, most (85%) of the ectomycorrhiza found at the sandy-loam sites were members of the Basidiomycotina, whereas more than half (52%) of the ectomycorrhiza at the cinder sites were most likely to be members of the Ascomycotina. Greater prevalence of members of the Ascomycotina has been observed in the ectomycorrhiza of white (Picea glauca) and blue spruce (P.
Molecular phylogeny of the lichen families Cladoniaceae, Sphaerophoraceae, and Stereocaulaceae (Lecanorales, Ascomycotina).
A synopsis of the lichen genus Psiloparmelia (Ascomycotina, Parmeliaceae).
Induccion-represion de la actividad celulolitica en Nectria catalinensis (Ascomycotina).
Taxonomy and phylogeny of Buellia species with pluriseptate spores (Lecanorales, Ascomycotina).
Cordyceps es el teleomorfo (forma sexual) de un hongo entomopatogeno perteneciente a la division Ascomycotina, parasito obligado de poblaciones de artropodos y considerado como el mas diverso del tropico.
Primer registro del genero Echinomyces (Ascomycotina, Diatrypales) para la micobiota de Mexico.
foliacea (Ascomycotina) complex and related species revealed through morphological, biochemical and phylogenetic analyses.
Nuevo registro del genero Microglossum (Ascomycotina, Geoglossaceae) para la micoflora mexicana.
Se tomaron en cuenta un total de 340 especies, pertenecientes a los Myxomycotina (2 especies determinadas), a los Ascomycotina (10 especies: 4 determinadas y 6 no determinadas), a los Basidiomycotina (329 especies: 158 determinadas y 171 no determinadas) (Fierros y Guzman-Davalos, 1997).