witches' butter

Any of several gelatinous fungi which are generally yellowish (resembling globs of butter) or black (resembling black butter), including those of species:

Tremella mesenterica, a yellow, gelatinous fungus (yellow brain fungus, golden jelly fungus).

Any of several gelatinous fungi which are generally yellowish (resembling globs of butter) or black (resembling black butter), including those of species:

Dacrymyces, a genus of yellow jelly fungus often confused with Tremella.

Any of several gelatinous fungi which are generally yellowish (resembling globs of butter) or black (resembling black butter), including those of species:

Dacrymyces, a genus of yellow jelly fungus often confused with Tremella.

Dacrymyces chrysospermus (orange witch's butter).

Any of several gelatinous fungi which are generally yellowish (resembling globs of butter) or black (resembling black butter), including those of species:

Exidia nigricans, a black, gelatinous fungus.

Any of several gelatinous fungi which are generally yellowish (resembling globs of butter) or black (resembling black butter), including those of species:

Exidia glandulosa (black witch's butter).

A yellow slime mold (Fuligo septica).

Certain species of Nostoc of blue-green algae, especially Nostoc commune, that form a brownish gelatinous mass when wet.