''Ciboria amentacea'', commonly known as the catkin cup, is a species of ascomycete

fungus 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 t ...

in the family

Sclerotiniaceae The Sclerotiniaceae are a family of fungi in the order Helotiales. Many species in this family are plant pathogens. Genera * '' Asterocalyx'' * ''Botryotinia'' * ''Botrytis'' * '' Ciboria'' * '' Ciborinia'' * '' Coprotinia'' * '' Cudoniopsis'' ...

. It is widespread in Europe and North America, where it grows on catkins of

willow Willows, also called sallows and osiers, from the genus ''Salix'', comprise around 400 speciesMabberley, D.J. 1997. The Plant Book, Cambridge University Press #2: Cambridge. of typically deciduous trees and shrubs, found primarily on moist so ...

and

alder Alders are trees comprising the genus ''Alnus'' in the birch family Betulaceae. The genus comprises about 35 species of monoecious trees and shrubs, a few reaching a large size, distributed throughout the north temperate zone with a few sp ...

. The species was first described by

Giovanni Battista Balbis Giovanni Battista Balbis (17 November 1765 – 3 February 1831) was an Italian botanist and politician who worked in Italy and France. He alternately was called Gioanni Battista Balbis and Jean-Baptiste Balbis. In 1804, botanist Antonio José ...

in 1804 as ''Peziza amentacea''. Karl Wilhelm Gottlieb Leopold Fuckel transferred it to '' Ciboria'' in 1870.

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* Fungi described in 1804 Fungi of Europe Fungi of North America Sclerotiniaceae {{Ascomycetes-stub