witches' butter

noun8

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