Fairyring

Basidiomycete fungi

The division of fungi known as the club fungi, Basidiomycota, includes some of the most familiar fungi. Mushrooms, puffballs, and shelf fungi are all members of this group, as are the plant rusts and smuts. This group, which contains approximately 15,000 known species, is distinguished by the presence of a club- shaped reproductive organ called the basidium. This organ is most likely derived from the ascus found in Ascomycota, with which it shares several characteristics. Both originate as a binucleate, dikaryotic structure and serve as a site for karyogamy and meiosis. They differ in that the basidium bears its spores outside while the ascus retains them inside the structure. 

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