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plural of .
the sac in ascomycetes in which the sexual spores are formed.
Historical Examples

asci are cylindrical; spores spindle-shaped, straight or bow-shaped, rough, 35–8; paraphyses thread-shaped.
The Mushroom, Edible and Otherwise M. E. Hard

The asci are cylindrical, slightly pointed at the apex, 8-spored.
The Mushroom, Edible and Otherwise M. E. Hard

These cysts are respectively known as sporangia, and asci or thecæ.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

The asci differ in shape and size, according to the species.
Student’s Hand-book of Mushrooms of America, Edible and Poisonous Thomas Taylor

Two asci of same, and contained spores, and accompanying filaments; more magnified.
The Elements of Botany Asa Gray

In the genus Elaphomyces, the asci are more than commonly diffluent.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

In some of these, the asci are evanescent, but in the greater number are permanent.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

Saccardo calls its asci (sacs which contain the spores) sporangia.
Student’s Hand-book of Mushrooms of America, Edible and Poisonous Thomas Taylor

Ascus (asci), a sac, the spore-case of Lichens and some Fungi.
The Elements of Botany Asa Gray

The asci are always present, the paraphyses are sometimes rare, and the mucilage in many cases seems to be entirely wanting.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

noun
the plural of ascus
noun (pl) asci (ˈæsaɪ; ˈæskaɪ)
a saclike structure that produces (usually) eight ascospores during sexual reproduction in ascomycetous fungi such as yeasts and mildews
n.

“sac in certain fungi,” 1830, Modern Latin, from Greek askos “leather bag, wine skin,” of unknown origin.

ascus as·cus (ās’kəs)
n. pl. as·ci (ās’ī’, -kī’)
A membranous, often club-shaped structure in which typically eight spores are formed through sexual reproduction of ascomycetes.
ascus
(ās’kəs)
Plural asci (ās’ī’, -kī’)
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.

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