The Family Nidulariaceae is a group of fungi commonly known as bird's nest fungi. These unique fungi have cup-shaped fruiting bodies that resemble tiny bird nests. While family Nidulariaceae is the most commonly used term, there are several synonyms for this group of fungi. Some of these synonyms include Cyathus, Crucibulum, Marasmiellus, and Mycocalia. In addition to their intriguing appearance, bird's nest fungi play an important role in ecosystem processes such as decomposition. Understanding the various synonyms for the Family Nidulariaceae can help to accurately identify and study these fascinating organisms.