Definition of Ascus

1. Noun. Saclike structure in which ascospores are formed through sexual reproduction of ascomycetes.

Generic synonyms: Reproductive Structure
Group relationships: Ascomycete, Ascomycetous Fungus



Definition of Ascus

1. n. A small membranous bladder or tube in which are inclosed the seedlike reproductive particles or sporules of lichens and certain fungi.

Definition of Ascus

1. Noun. A sac-shaped cell present in ascomycete fungi; it is a reproductive cell in which meiosis and an additional cell division produce eight spores. ¹

¹ Source: wiktionary.com

Definition of Ascus

1. a spore sac in certain fungi [n ASCI]

Medical Definition of Ascus

1. Elongated spore case containing 4 or 8 haploid sexual ascospores of ascomycete fungi (which include yeasts). This entry appears with permission from the Dictionary of Cell and Molecular Biology (22 Feb 2008)

Ascus Pictures

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Lexicographical Neighbors of Ascus

ascots
ascovirus
ascoviruses
ascribable
ascribable(p)
ascribe
ascribed
ascribed status
ascribed statuses
ascribes
ascribing
ascription
ascriptions
ascriptitious
ascriptive
ascus (current term)
asdfghjkl
asdic
asdics
asea
asearch
asearched
asearches
asearching
aseasonal
asecretory
asectarian
aseismic
aseities
aseity

Literary usage of Ascus

Below you will find example usage of this term as found in modern and/or classical literature:

1. Sexual Reproduction and the Organization of the Nucleus in Certain Mildews by Robert Almer Harper (1905)
"the excessive assimilative activity in the ascus has inhibited nuclear division just as in ... The nucleus of the ascus divides to form two daughter nuclei, ..."

2. Memoirs of the Torrey Botanical Club by Torrey Botanical Club (1902)
"ascus with uniseriate spores. 6 ascus with biseriate spores ; 5 and 6 are from ... ascus with slightly larger spores from New York City. 15. Three spores. ..."

3. British Fungus-flora: A Classified Text-book of Mycology by George. Massee (1895)
"22, ascus of same; highly X ;—Fig. 23, spores of same; X 300;—Fig. ... 27, same; X ;—Fig. 28, section of same; X ;—Fig. 29, ascus and ..."

4. Lectures on Plant Physiology by Ludwig Jost (1907)
"A certain amount of interest, however, attaches to the type of ascus which ... Before the spores begin to be ejected a sudden extension of the ascus takes ..."

5. Science by American Association for the Advancement of Science (1914)
"The source of the two fusing nuclei Dangeard did not trace back farther than the sub- terminal cell of a hooked hypha from which the ascus arises in Peziza ..."

6. The American Naturalist by American Society of Naturalists, Essex Institute (1905)
"The two nuclei in the ascus then fuse. The origin of the original pair is not known. No satisfactory explanation of this fusion in the ascus has been ..."

7. Botanical Gazette by University of Chicago, JSTOR (Organization) (1918)
"Certain investigators maintain that the fusion nucleus of the ascus is the product of two successive nuclear fusions, the first of these taking place ..."

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