Bisporella citrina

Scientific nameBisporella citrina (Batsch) Korf &
S. E. Carp. 
Derivation of nameCitrin- means "lemon-yellow."  
Synonyms:  Helotium citrinum; Calycella citrina
Common name(s):  Yellow fairy cups
Phylum:   Ascomycota
Order:   Helotiales
Family:   Helotiaceae
Occurrence on wood substrate: Saprobic; in clusters on
decaying wood; summer through fall.  
Dimensions: Cups are 1-3 mm wide; stalkless or with
thick, stalk-like base.            
Sterile outer surface:  Bright lemon-yellow to golden-
yellow; smooth.
Fertile inner surface: Same coloration as sterile surface;
Edibility: Unknown
Comments: Although individually tiny, these fungi often
occur in such large numbers that they become quite

More information at   

Figure 1. The bright yellow fruit bodies of Bisporella citrina
are very common on decaying wood. Photo © Gary

Figure 2. The color of the fruit bodies ranges from
bright lemon-yellow to golden-yellow.
Photo © Larry Grand.

Figure 3. Bisporella citrina may have a rudimentary
stalk, as shown here, or it may be stalkless.
Photo © Gary Emberger.

Figure 4. Yellow fairy cups typically occurs in groups or
dense clusters. Photo © Gary Emberger.

Figure 5. The fertile inner (upper) surface and outer surfaces
are the same color. Photo © Gary Emberger.

Figure 6. Another small cup fungus, Chlorosplenium chlora,
has a bright yellow outer surface but the fertile surface
becomes greenish at maturity. Bisporella citrina is on the
right and Chlorosplenium chlora is on the left.
Photo © Gary Emberger.


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