volva

Thân thiện

A mushroom's volva remains at the base of its stalk after it emerges.

Definition

Noun: A volva is a distinct, cup-like or sac-like structure that surrounds the base of the stalk (stipe) in certain fungi, particularly in some mushrooms. It is a remnant of the universal veil, a protective tissue that initially encloses the entire immature mushroom.

Usage

The term is used specifically in mycology (the study of fungi) to describe a key identifying feature. The presence, shape, and characteristics of a volva are critical for differentiating between species, especially when identifying poisonous mushrooms like some Amanita species.

Examples

• When identifying the deadly Death Cap mushroom (), look for a prominent, white volva at the base of its stem.
• The mycologist noted that the specimen had a membranous, sack-like volva, which helped classify it within the genus .
• Not all mushrooms have a volva; its absence is an important diagnostic characteristic for many edible species.

Advanced Usage

• "Volval" (adjective): Pertaining to or resembling a volva.
  • The volval remnants on the cap's surface are another key identification feature.

Variants and Related Words

• Universal veil: The temporary protective tissue that covers some developing mushrooms, which ruptures to leave remnants like the volva at the base and patches (warts) on the cap.
• Annulus: Another remnant of the universal veil or partial veil; a ring-like structure on the mushroom's stalk, often found above the volva.

Synonyms

• Basal cup
• Fungal cup

Notes on Meaning

The word volva has a single, highly specific meaning in scientific English, referring exclusively to this anatomical structure in fungi. It does not have general or idiomatic uses.

Học thuật

Noun

1. cuplike structure around the base of the stalk of certain fungi