Tremella mesenterica

Scientific name:  Tremella mesenterica Retz.
Derivation of nameTrem- means "to shake or tremble."
- means "middle intestine."
SynonymsTremella lutescens Pers.  
Common name(s):  Witch's butter.
Phylum:   Basidiomycota
Order:   Tremellales
Family:   Tremellaceae
Occurrence on wood substrate: Parasitic on wood decay
fungi, typically on the out-of-sight mycelium in the wood;
clustered on decaying deciduous wood; year-round.   
Dimensions: Fruitbody 2.5-10 cm wide and 3-4 cm high.    
Description: Brain-like to multilobed gelatinous mass; pale
yellow to orange-yellow, dark orange on drying.
 Witch's butter can dry down and rehydrate
many times. Compare to Dacrymyces palmatus, a species
similar in appearance. Dacrymyces palmatus grows on
conifer wood and has a white point of attachment. Although
Tremella mesenterica is found on wood, it is actually a
parasite of wood decay fungi colonizing the wood. All
Tremella species are reported to be parasites of wood decay

More information at  
More information at  

Figure 1. Irregularly lobed, gelatinous mass of Tremella
. Photo © William Roody.

Figure 2. Another view of Witch's Butter. Photo © Pam

Figure 3. Tremella mesenterica. Photo © George


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