abstract:Tremella mesenterica (common names include yellow brain, golden jelly fungus, yellow trembler, and witches' butterAlternatively spelled witch's or witches) is a common jelly fungus in the Tremellaceae family of the Agaricomycotina. It is most frequently found on dead but attached and on recently fallen branches, especially of angiosperms, as a parasite of wood decay fungi in the genus Peniophora.