Entorrhizomycetes is a small class of fungi within the phylum Basidiomycota, characterized by their unique ecological role as root-associated parasites, primarily infecting the roots of plants in the families Cyperaceae and Juncaceae. Members of this class form coiled hyphal structures inside host root cells and produce teliospores, which are thick-walled resting spores adapted for survival in soil. Unlike many other basidiomycetes, Entorrhizomycetes have a relatively simple life cycle and are not well-known for forming elaborate fruiting bodies. They are of interest in mycology and plant pathology due to their specialized host interactions and evolutionary position, which may offer insights into the early diversification of Basidiomycota.