Ciboria amentacea

Ciboria amentacea, commonly known as the catkin cup,^[2] is a species of ascomycete fungus in the family Sclerotiniaceae. It was first described by Giovanni Battista Balbis in 1804 as Peziza amentacea. Karl Wilhelm Gottlieb Leopold Fuckel transferred it to Ciboria in 1870.^[1]

Ciboria amentacea
Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Leotiomycetes
Order:	Helotiales
Family:	Sclerotiniaceae
Genus:	Ciboria
Species:	C. amentacea
Binomial name
Ciboria amentacea (Balb.) Fuckel (1870)
Synonyms[1]
Peziza amentacea Balb. (1804) Rutstroemia amentacea (Balb.) P.Karst. (1871) Hymenoscyphus amentaceus (Balb.) W.Phillips (1887)

The cap is up to 1.2 centimetres (1⁄2 in) across.^[2] The species is widespread in Europe and North America, where it grows on catkins of willow and alder.^[3]