asci

A scientist examines the asci of a fungus under a microscope.

Definition

1. Noun (plural of ascus):
   • A saclike structure in fungi: "asci" are specialized reproductive cells or structures found in ascomycete fungi, containing spores (typically eight) produced by meiosis. They are a key feature of the phylum Ascomycota.
   • Botanical context: In mycology, "asci" refer to the spore-bearing cells within the fruiting body (ascocarp) of certain fungi, such as truffles, morels, and yeasts.

Usage Examples

• (The spore-containing sacs were observed.)
• (The saclike structure holds the spores.)
• (The reproductive structures define this fungal group.)

Advanced Usage

• "Ascus" (singular) vs. "asci" (plural): The term "ascus" is used for a single sac, while "asci" is the standard plural form.

  • A single ascus can produce up to eight spores. (One sac.)
  • Many asci are arranged in a layer called the hymenium. (Multiple sacs.)

• "Ascospore": A spore produced inside an ascus.

  • The ascospores are forcibly ejected from mature asci. (Spores released from the sacs.)

Variants and Related Words

• Ascus (n, singular): the individual saclike structure.

  • The ascus wall is thin and delicate. (The sac's outer layer.)

• Ascomycete (n): a fungus that produces spores in asci.

  • Morels and truffles are ascomycetes. (Fungi with asci.)

• Ascocarp (n): the fruiting body that contains asci.

  • The cup-shaped ascocarp holds numerous asci. (The structure housing the sacs.)

Synonyms

• Spore sac: a general term for a structure containing spores (less specific).
• Spore case: another informal synonym, though "asci" is precise for fungal sacs.

Related Idioms

• "In the ascus": used in mycology to describe spore location.
  • The spores are still in the ascus, not yet released. (Inside the sac.)

Phrasal Verbs