Yellow Fairy Cups
Calycina citrina syn. Bisporella citrina
November 22nd, 2023
St. Charles County, Missouri, USA
Olivia R. Myers
@oliviarosaline
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seen from United States
seen from Greece
seen from United States
seen from Brazil
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Yellow Fairy Cups
Calycina citrina syn. Bisporella citrina
November 22nd, 2023
St. Charles County, Missouri, USA
Olivia R. Myers
@oliviarosaline

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Bisporella citrina
Yellow Fairy Cups, Lemon Discos
(via)
Wasp nest slime mold (Metatrichia vesparium). Its capillitial threads can be seen in the second photo (as well as some Bisporella citrina in the background).
10/16 at Flambeau River State Forest, Wisconsin
Bisporella citrina
7/16 at Flambeau River State Forest
Here are some swatches of Bisporella citrina the Lemon Disco. Each cup is less than 3mm across, but they can swarm in large enough numbers to be collectively eye-catching despite their tiny size. They grow on well rotted logs of deciduous trees.

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Bisporella citrina | ©Amadej Trnkoczy (Mt. Mangart region, northeast ridge of Mt.Planja, Posočje, Slovenia)
Commonly known as Lemon Disco or Yellow fairy cup, Bisporella citrina (Heliotales - Heliotaceae) is a tiny and colorful wood-rotting fungus, commonly found on dead oaks and other hardwoods.
Citrin - literally means lemon-yellow, but don't let that mislead you, often the fruit bodies are often a bright daffodil yellow.
This ascomycete is found in Britain and Ireland, throughout mainland Europe as well as in many other parts of the world including North America.
[Source]
Detailed aspects of the specimens shown in the photo are supplied by the photographer (click on the title link).
Lemon Drops / Yellow Fairy Cups on Flickr.