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Fungi Clamp Connection

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The Dikarya embrace two great phyla, the Ascomycota and the Basidiomycota, accounting for

the vast majority of fungi. The obvious difference between these two groups is the way that they

produce their spores following meiosis, depicted in the picture at left. The Basidiomycota

produce their meiospores, called basidiospores, externally on basidia (leftmost of the two

panels), while the Ascomycota produce theirs, called ascospores, in asci (right panel). To learn

more about these structures and how they produce their spores read the section on asci and

basidia. The picture at left does not do justice to the variety of these structures. Basidia can be

round or elongated, 1-spores to 8-spored, septate or nonseptate. Asci can be round to elongated

and contain a single spore or more than a thousand. Ascospores can range from single-celled to

many-celled. In general we can say that basidia are most commonly 4-spored and asci 8-spored,

and that basidiospores are almost always single-celled. One invariable fact is that basidiospores

are always borne externally on the basidium and ascospores are always borne internally in the

ascus.

There are other less obvious differences between the Asco- and Basidiomycota. Of course as

members of the Dikarya both groups spend part of their lives in a dikaryotic state, one in which

their cells contain two genetically different nuclei that divide together so that the daughter

nucleus of each one moves into the new cell.

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1 Surname Student’s Name Course Date The Dikarya embrace two great phyla, the Ascomycota and the Basidiomycota, accounting for the vast majority of fungi. The obvious difference between these two groups is the way that they produce their spores following meiosis, depicted in the picture at left. ...
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