Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A membranous, often club-shaped structure in which typically eight ascospores are formed through sexual reproduction of ascomycetes.
Century Dictionary and Cyclopedia
- n. In botany, the spore-case of lichens and ascomycetous fungi, consisting of a single cell, usually the swollen terminal cell of a branch of a hypha, from the protoplasm of which the spores (typically 8) are produced. Also called ascidium and theca.
- n. In archœol., same as askos.
Wiktionary
- n. A sac-shaped cell present in ascomycete fungi; it is a reproductive cell in which meiosis and an additional cell division produce eight spores.
GNU Webster's 1913
- n. (Bot.) A small membranous bladder or tube in which are inclosed the seedlike reproductive particles or sporules of lichens and certain fungi.
WordNet 3.0
- n. saclike structure in which ascospores are formed through sexual reproduction of ascomycetes
Etymologies
- From Ancient Greek ἀσκός (askos, "a sac"). (Wiktionary)
- New Latin, from Greek askos, bag. (American Heritage® Dictionary of the English Language, Fourth Edition)
Examples
“The mildews may be divided into two genera: _Podosphæra_, with a single ascus in the spore fruit; and _Erysiphe_, with two or more.”
Elements of Structural and Systematic Botany For High Schools and Elementary College Courses
“For instance, in the asci of lichens there are formed from a portion of the protoplasm four or more small ascospores, which secrete a cell-wall and lie loose in the ascus.”
“They are set free by the rupture of the ascus, and germinate by putting out through their walls one or more filaments which branch and form the thallus of a new individual.”
“An ascus of _Buella parasema_, containing 8 spores.”
Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 The Ascomycetes of Ohio IV and V
“Thallus granulose to verrucose and subareolate, sometimes inconspicuous and evanescent; apothecia minute to middle-sized, adnate or more or less immersed, exciple usually prominent and persistent, but sometimes becoming covered, disk flat to convex; hypothecium and hymenium pale to brown; spores simple, hyaline, minute, numerous in each ascus.”
Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 The Ascomycetes of Ohio IV and V
“Spores minute, numerous in each ascus _Biatorella_, p. Spores larger, usually 8 in each ascus,”
Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 The Ascomycetes of Ohio IV and V
“In this group, however, the spores are borne inside of club-shaped bodies, called sacs or asci (singular, ascus).”
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
“[F] The sub-class Ascomycetes includes the morels, helvellas, cup fungi, etc., and many microscopic forms, in which the spores are borne inside a club-shaped body, the ascus.”
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
“In the latter species there are only two spores in an ascus.”
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc.
“This fungus projects eight spores at once using a spray of fluid from the plant's spore-bearing cells, which make up the ascus.”
Lists
These user-created lists contain the word ‘ascus’.
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Mycology
basidiomycete, initiation, fungus, shiitake, inoculum, substrate, fruit body, mycelium, hyphal growth, oyster, spawn run, polypore and 207 more...
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A Galimafrée of Plant Anatomy & Morph...
A hodgepodge, jumble, jambalaya, *gallimaufry, circus and tent revival of plant anatomy and morphology terms and phrases - its a big tent, and no tickets are required.
*array, collecti...naked bud, leaf blade, brochidodromous, serrate, cork cambium, rhizomatous, flower stalk, deciduous sepal, petal, whorl, nectar gland, stamen and 1348 more...
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Words of the Day
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Permutations
There are 17576 different sequences of three letters (26 x 26 x 26). How many of them occur in words? General rules of engagement: mononyms only, lower case preferred to upper case, short preferred...
aaargh, niqaabi, Isaac, raad, baaed, haaf, laager, aah, kamaaina, Naajaat, aak, aalii and 637 more...
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