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

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

in the family Sclerotiniaceae. It is widespread in Europe and North America, where it grows on

catkin A catkin or ament is a slim, cylindrical flower cluster (a spike), with inconspicuous or no petals, usually wind- pollinated ( anemophilous) but sometimes insect-pollinated (as in '' Salix''). It contains many, usually unisexual flowers, arra ...

s of

willow Willows, also called sallows and osiers, of the genus ''Salix'', comprise around 350 species (plus numerous hybrids) of typically deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions. Most species are known ...

and

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

. The species was first described by Giovanni Battista Balbis 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 Fungus species {{Ascomycetes-stub