witches' butter
Rare / Obscure / SpecialisedInformal / Colloquial / Non-technical (in its primary sense as a folk name for fungi)
Definition
Meaning
A common name for various jelly fungi, primarily Tremella mesenterica, which forms bright yellow, gelatinous masses on dead wood.
The term is sometimes used more broadly for other gelatinous fungi of a similar appearance. It can occasionally serve as a metaphor for something unpleasantly slimy or unnatural-looking in informal contexts.
Linguistics
Semantic Notes
The term is chiefly known to mycologists, foragers, and naturalists. It is not part of everyday vocabulary and would be unknown to most general English speakers.
Dialectal Variation
British vs American Usage
Differences
No significant differences in usage or meaning between UK and US English, as it is a specialised natural history term.
Connotations
In both varieties, the primary connotation is simply descriptive of the fungus's appearance. The folkloric association with witches is largely etymological and not part of active connotation.
Frequency
Equally rare in both dialects.
Vocabulary
Collocations
Grammar
Valency Patterns
There is [some] witches' butter on the log.We found witches' butter growing on...It looks like witches' butter.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Used only in mycology or natural history contexts as a common name.
Everyday
Almost never used. Would require explanation if mentioned.
Technical
Used as a vernacular identifier in field guides and foraging literature.
Examples
By CEFR Level
- Look at the yellow jelly on the wood.
- I saw a strange yellow fungus in the forest today.
- The forager identified the gelatinous growth as witches' butter, a type of edible jelly fungus.
- Despite its unappealing nickname 'witches' butter,' Tremella mesenterica is considered harmless and is used in some traditional cuisines.
Learning
Memory Aids
Mnemonic
Imagine a witch's cauldron with melted, slimy yellow butter spilling onto a rotten branch—that's the fungus.
Conceptual Metaphor
A SLIME IS A FOOD SUBSTANCE (butter). A FUNGUS IS A SUPERNATURAL ARTEFACT.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate literally as 'масло ведьм'. The term is a fixed name for a specific organism, not a descriptive phrase.
Common Mistakes
- Incorrect apostrophe placement (e.g., witch's butter vs. witches' butter). Both are attested, but 'witches'' is more standard for the plural possessive.
- Assuming it is a common term known to all speakers.
Practice
Quiz
What is 'witches' butter' most accurately described as?
FAQ
Frequently Asked Questions
Yes, Tremella mesenterica (witches' butter) is generally considered non-toxic and is eaten in some cultures, though it is bland and valued more for texture.
The name likely comes from its unnatural, gelatinous, butter-like appearance and its association with damp, decaying wood, which evoked supernatural or eerie feelings.
Yes, 'yellow brain fungus' and 'witches' butter' are common names for the same species, Tremella mesenterica.
While sometimes seen in informal writing, the standard form includes the apostrophe to indicate the possessive ('witches''), as it is the butter of (associated with) witches.