Fungi that can live only in mycorrhizal association with roots of plants may be placed into a phylum named:

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Quizplus · Accepted Answer

Glomeromycota is the only phylum consisting entirely of fungi that form mycorrhizal associations exclusively with the roots of plants. The other options do not fit this criterion. Deuteromycota is not a valid phylum, but rather a grouping of fungi with no known sexual reproductive stages. Ascomycota includes many types of fungi such as yeasts and molds but not all are mycorrhizal. Rootomycota and Symbiomycota are not recognized phyla.

Fungi That Can Live Only in Mycorrhizal Association with Roots