Biannulariaceae
The Biannulariaceae are a family of fungi in the order Agaricales. The family contains three genera. All species form agaricoid basidiocarps (gilled mushrooms). The family was originally described to accommodate the single genus ''Catathelasma ...
.Basidiocarps (fruit bodies) are agaricoid, similar to those of '' Clitocybe'', but with a distinctly hard stipe (stem). The genus is separated on DNA characteristics as well as morphology. Species are known from Europe, North Africa, and northern China.