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Sentences for "asci "
New ampullas push themselves between those which are ripening and withering; a disc can, under favourable circumstances, always form new asci for weeks at a time.
The hymenium in some genera consists of elongated, nearly cylindrical asci, enclosing a definite number of sporidia; in the true truffles and their immediate allies, the asci are broad [Pg 56] sacs, containing very large and beautiful, often coloured, sporidia.
The subhymenial tissue is composed of small compact cells, forming generally a more coloured and dense stratum, the superior cells of which give rise to the asci and paraphyses.
The asci are always present, the paraphyses are sometimes rare, and the mucilage in many cases seems to be entirely wanting.
However this may be, some mycologists are of opinion that, at least in some of the Ascomycetes, the paraphyses are abortive asci, or, at any rate, that abortive asci mixed with the paraphyses cannot be distinguished from them.
The asci appear first at the base of the paraphyses, under the form of oblong cells, filled with colourless protoplasm.
There is manifestly a succession in formation and maturity of the asci in a receptacle.
The dehiscence of the asci takes place in the Ascobolei, in some species of Peziza, Morchella, Helvella, and Verpa, by means of an apical operculum, and in other Pezizæ, Helotium, Geoglossum, Leotia, Mitrula, &c.
The formation and growth of the asci and sporidia differ little from what we have described, and when mature the asci dehisce, and the sporidia alone are ejected from the ostiolum.
We are not aware that operculate asci have yet been detected.
In the interior of the receptacles, pear-shaped or ovate asci are formed in clusters, attached together at the base, and containing two or more hyaline sporidia.
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