Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A membranous, often club-shaped structure in ascomycetes in which karyogamy occurs, followed by the formation of eight haploid ascospores.
from The Century Dictionary.
- noun 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. - noun In archœol., same as
askos .
from the GNU version of the Collaborative International Dictionary of English.
- noun (Bot.) A small membranous bladder or tube in which are inclosed the seedlike reproductive particles or sporules of lichens and certain fungi.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
sac -shapedcell present inascomycete fungi ; it is a reproductive cell in whichmeiosis and an additional cell division produce eightspores .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun saclike structure in which ascospores are formed through sexual reproduction of ascomycetes
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
Support
Help support Wordnik (and make this page ad-free) by adopting the word ascus.
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 Douglas Houghton Campbell
-
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.
Scientific American Supplement, No. 531, March 6, 1886 Various
-
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.
Scientific American Supplement, No. 531, March 6, 1886 Various
-
An ascus of _Buella parasema_, containing 8 spores.
Ohio Biological Survey, Bull. 10, Vol. 11, No. 6 The Ascomycetes of Ohio IV and V Leafy Jane Corrington Hilker 1894
-
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 Leafy Jane Corrington Hilker 1894
-
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 Leafy Jane Corrington Hilker 1894
-
[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. George Francis Atkinson 1886
-
In the latter species there are only two spores in an ascus.
Studies of American Fungi. Mushrooms, Edible, Poisonous, etc. George Francis Atkinson 1886
-
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. George Francis Atkinson 1886
-
This fungus projects eight spores at once using a spray of fluid from the plant's spore-bearing cells, which make up the ascus.
Comments
Log in or sign up to get involved in the conversation. It's quick and easy.