Black Witches' Butter

Black witches' butter (Exidia glandulosa), also known as black jelly roll or warty jelly fungus, is a common, wood-rotting jelly fungus that's typically found on dead branches of diciduous trees. It's shiny, black, and blister-like, and grows both alone or in clusters. The consistency is squishy and gelatinous, especially after wet weather. In prolonged, dryer weather they can shrivel up to hard, membranous lumps.