- plural of ascus.
- the sac in ascomycetes in which the sexual spores are formed.
Origin of ascus
Examples from the Web for asci
Historical Examples of asci
The asci are cylindrical, slightly pointed at the apex, 8-spored.The Mushroom, Edible and Otherwise
M. E. Hard
The asci differ in shape and size, according to the species.
These cysts are respectively known as sporangia, and asci or thecæ.
In the genus Elaphomyces, the asci are more than commonly diffluent.
In some of these, the asci are evanescent, but in the greater number are permanent.
- the plural of ascus
- a saclike structure that produces (usually) eight ascospores during sexual reproduction in ascomycetous fungi such as yeasts and mildews
Word Origin for ascus
"sac in certain fungi," 1830, Modern Latin, from Greek askos "leather bag, wine skin," of unknown origin.
- A membranous, often club-shaped structure in which typically eight spores are formed through sexual reproduction of ascomycetes.
- A membranous, often club-shaped structure inside which ascospores are formed through sexual reproduction in species of the fungi known as ascomycetes. The ascus is unique to ascomycetes and distinguishes them from other kinds of fungi. Asci are formed when two hyphae that are sexually compatible conjugate. Each ascus typically develops eight ascospores. Asci swell at maturity until they burst, shooting the ascospores into the air.