The Biannulariaceae are a

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from ...

in the order

Agaricales The fungal order Agaricales, also known as gilled mushrooms (for their distinctive gills) or euagarics, contains some of the most familiar types of mushrooms. The order has 33 extant families, 413 genera, and over 13,000 described species, alo ...

. The family contains three

genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...

. All

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

form agaricoid basidiocarps (gilled mushrooms). The family was originally described to accommodate the single genus ''

Catathelasma ''Catathelasma'' is a genus of fungi in the family (biology), family Biannulariaceae. Basidiocarps (fruit bodies) are agaric, agaricoid, with a conspicuous Universal veil, veil (leaving a double ring on the stem), Lamella (mycology), adnate to d ...

'', but has been extended as a result of DNA research.

References

Agaricales Agaricales families {{Basidiomycota-stub