Collybia

thumb|Collybia phyllophila|Collybia phyllophila, the frosty funnel thumb|Collybia nuda, the blewit thumb|Collybia brunneocephala, the brown blewit thumb|Collybia cirrhata, the piggyback shanklet thumb|right|Collybia tuberosa, the lentil shanklet, grows on the decaying remains of other fungi or vegetation

Collybia (in the strict sense) is a genus of mushrooms in the family Clitocybaceae. The genus has a widespread distribution in northern temperate areas, and contains well known species like the blewit, sordid blewit, and frosty funnel, as well as various species that grow on the decomposing remains of other mushrooms. The name Collybia means "small coin". thumb|Image of a "Collybia maculata", now Rhodocollybia maculata from 1933 == History of taxonomy == Until recently a large number of other white-spored species, some very common, were assigned to this genus, but the majority have been separated into other genera: Gymnopus, Rhodocollybia and Dendrocollybia, leaving the genus with only three species. Later, research published in 2023 reassigned a number of species previously considered to be in the genus Clitocybe to the genus Collybia, including the edible blewit and brownit mushrooms, expanding the genus once again.