A portion of a section of the hymenium of Peltigera canina, showing two ascicontaining spores, two asci with protoplasmic contents, and five paraphyses.
The Sphaeropsideae somewhat resemble the Pyrenomyceteae in external characteristics, but differ from them in the absence of asci and paraphyses.
The Hypogaei are analogous to the Tuberacei, except that the spores are not contained in ascias in the latter.
In the plants of this family the spores are not supported upon basidia, but instead are enclosed in minute sacs or asci formed from the fertile cells of a hymenium.
The asci differ in shape and size, according to the species.
Saccardo calls its asci (sacs which contain the spores) sporangia.
The asci are large, 8-spored, the spores being elliptical.
The hypothecium is the basal part of the apothecium on which the hymenium is borne; the latter consists of asci (thecae) with ascospores, and paraphyses.
In these forms gonidia are found in connexion with the young fruit; such algal cells undergo numerous divisions becoming very small in size and penetrating into the hymenium among the asci and paraphyses.
Phycomyces), but those of many asci and spores are large and easily rendered visible.
The ordinary mycelium is the gametophyte since it bears the ascogonia and antheridia when present; the ascogenous hyphae with their asci represent the sporophyte since they are derived from the fertilized ascogonium.
The ascospores escape from the asciin various ways, sometimes by a special ejaculation-mechanism.
The asci are developed in the large dense fruit bodies (cleistothecia) and the spores escape by the decay of the wall.
The asci may be derived from the terminal cell of the branches of the ascogenous hyphae, but usually they are derived from the penultimate cell, the tip curving over to form the so-called crozier.
In the Helvellaceae there is no apothecium but a large irregular fruit body which at maturity bears the asci on its surface.
The asci are borne directly on the mycelium and are therefore fully exposed, being devoid from the beginning of any investment.
The other divisions of the Ascomycetes may be distinguished as Carpoascomycetes because they do not bear the asci free on the mycelium but enclosed in definite fruit bodies or ascocarps.
From analogy, at any rate, the spores of all these similar species are probably borne in asci which disappear early, and Phylacia seems to be the same genus as Camillea, the walls of the perlthecla disintegrating and forming a powdery mass.
The asci which disappear at at very early stage, are shown by Moeller as oval, each containing 8 spores.
The lirellæ are lined at the sides with a black (carbonaceous) layer or excip´ulum, within which are situated the asci and paraphyses.
The asci are broad and short, and contain only two spores.
The asci are situated upon the inner surfaces of the winding canals traversing the substance of the fleshy fruit (peridium) of which the truffle consists.
These asci are usually enclosed in a capsule or perithécium.
It does not possess the ordinary form of a Peziza, which is that of a cup fixed at the end of a stalk, like a mushroom with the cup turned inside out, the asci lining its interior.
The asci and paraphyses are very minute, but do not differ essentially in structure from those of Parmelia.
They are in general distinguishable with facility from the Fungi of other Orders, by the arrangement of the spores in colourless sacs or asci (Pl.
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.
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 perfect sporidia are also very minute and numerous, being contained in asci borne in cups, which usually surround the spermogonia.
In Tympanis, asci of two kinds have been observed in some species; one kind containing an indefinite number of very minute bodies resembling spermatia, and the other octosporous, containing sporidia of the usual type.
The asci in which these sporidia are generated mostly partake of a broadly saccate, ovate form.
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 lines the inner walls of the perithecium, and forms a gelatinous nucleus, consisting of asci and paraphyses.
The asci are always present, the paraphyses are sometimes rare, and the mucilage in many cases seems to be entirely wanting.
Two of theasci and contained double spores, quite like those of a Lichen; much magnified.
Two asci of same, and contained spores, and accompanying filaments; more magnified.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "asci" in a variety of sentences. We hope that you will now be able to make sentences using this word.
