witches' butter

Meanings

1. Any of several gelatinous fungi which are generally yellowish (resembling globs of butter) or black (resembling black butter), including those of species:
2. Tremella mesenterica, a yellow, gelatinous fungus (yellow brain fungus, golden jelly fungus).
3. Dacrymyces, a genus of yellow jelly fungus often confused with Tremella.
4. Dacrymyces chrysospermus (orange witch's butter).
5. Exidia nigricans, a black, gelatinous fungus.
6. Exidia glandulosa (black witch's butter).
7. A yellow slime mold (Fuligo septica).
8. Certain species of Nostoc of blue-green algae, especially Nostoc commune, that form a brownish gelatinous mass when wet.