Plectomycetes
Definition
Noun 1. A taxonomic class of fungi: Plectomycetes is a class of fungi characterized primarily by the formation of a specific type of enclosed fruiting body called a cleistothecium. The spores (ascospores) within this structure are only released when the fruiting body wall decays or disintegrates.
Examples
- Noun:
- The Plectomycetes include many common molds, such as those in the genus Aspergillus.
- Fungi classified under Plectomycetes produce their spores inside a cleistothecium.
Advanced Usage
- Taxonomic Context: In modern fungal taxonomy, the classification "Plectomycetes" is considered part of a historical morphological grouping. Many fungi once placed here are now reclassified within the phylum Ascomycota based on genetic data, though the descriptive term for the cleistothecial fruiting body remains relevant.
- While the formal class Plectomycetes is less used in phylogenetic systems, the morphological feature—the cleistothecium—is a key diagnostic character.
Variants and Related Words
- Cleistothecium (noun): The enclosed, spherical fruiting body (ascocarp) typical of fungi in the Plectomycetes, which lacks a natural opening for spore release.
- The cleistothecium is a defining structure for these fungi.
- Ascomycete (noun): A member of the phylum Ascomycota, the larger group to which these fungi belong, characterized by producing spores in a sac-like cell called an ascus.
- All Plectomycetes are ascomycetes.
Synonyms
- Cleistothecial fungi: A descriptive synonym emphasizing the defining structural characteristic.
- The study focused on cleistothecial fungi found in soil samples.
Related Terms
- Ascomycota (noun): The phylum or division of fungi that produce ascospores inside an ascus. Plectomycetes is a class within this group.
- Eurotiomycetes (noun): A modern class of Ascomycota that includes many fungi (e.g., , ) formerly placed in Plectomycetes, based on molecular phylogenetic classification.
Noun
-
class of fungi in which the fruiting body is a cleistothecium (it releases spores only on decay or disintegration)
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