witches' butter

Noun

witches' butter (usually uncountable, plural witches' butters)

1. (usually) Tremella mesenterica, a yellow, gelatinous fungus (yellow brain fungus, golden jelly fungus).
2. (usually) Dacrymyces, a genus of yellow jelly fungus often confused with Tremella.
3. (usually) Dacrymyces chrysospermus (orange witch's butter).
4. (usually) Exidia nigricans, a black, gelatinous fungus.
5. (usually) Exidia glandulosa (black witch's butter).
6. (usually) The yellow slime mold Fuligo septica.
7. (usually) Certain species of Nostoc of blue-green algae, especially Nostoc commune, that form a brownish gelatinous mass when wet.