Ascus



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

Other species contain linear sporidia, which are often the length of the ascus, and may either be simple or septate.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

In the latter species there are only two spores in an ascus.
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. George Francis Atkinson

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

ascus, the club-shaped body which bears the spores inside (characteristic of the Ascomycetes).
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. George Francis Atkinson

Sporidia of same inclosed in ascus with accompanying paraphyses.
Student’s Hand-book of Mushrooms of America, Edible and Poisonous Thomas Taylor

This operculum may be the more readily seen when the ascus is coloured by a drop of tincture of iodine.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

By crushing the ripe spore fruit, these spores still enclosed in the mother cell (ascus) may be forced out (Fig. 39, H).
Elements of Structural and Systematic Botany Douglas Houghton Campbell

Thallus septate; spores developed in special type of sporangium, the ascus, the number of spores being usually eight.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 Various

Some of these are indefinite in the number contained in an ascus, although the majority are eight, and a few less.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

In the development of the ascus we find two nuclei at the base which fuse together to form the single nucleus of the young ascus.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 Various

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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  • Asci

    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 […]

  • Ascidium

    a baglike or pitcherlike part. Historical Examples It is not in all cases easy to trace the origin and true nature of the ascidium, as the venation is sometimes obscure. Vegetable Teratology Maxwell T. Masters noun (pl) -cidia (-ˈsɪdɪə) part of a plant that is shaped like a pitcher, such as the modified leaf of […]



  • Ascidian

    any solitary or colonial tunicate of the class Ascidiacea, exhibiting in the larval stage the vertebrate characteristics of a notocord and hollow nerve cord. belonging or pertaining to the class Ascidiacea. Historical Examples Chabry had published in 1887 some interesting results on the ascidian egg, which strongly supported the Roux-Weismann theory. Form and Function E. […]

  • Ascigerous

    of or relating to . Historical Examples The lichens, according to the “Schwendener Hypotheses,” consist of ascigerous fungi parasitic on alg. Student’s Hand-book of Mushrooms of America, Edible and Poisonous Thomas Taylor As at present limited, the Pyrenomycetes are “ascigerous fungi having the fructification enclosed within a perithecium.” Student’s Hand-book of Mushrooms of America, Edible […]



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